Begin by opening any photo into Photoshop. The image I used for this tutorial looks pretty decent, but try using an image that doesn't look very interesting. Lomo cameras are popular for making every photo look interesting even if it has the worst composition. 
The first step is to alter the color so that it imitates the color of photos taken with a real lomo camera. Lomo cameras tend to have vintage-looking colors because the reds in the photo have higher contrast. You can check this yourself by opening an image taken with a lomo camera into Photoshop and looking at the channels. If you do do this, make sure that you acquire images taken with a real lomo camera and not images that are converted with Photoshop. If you do a google search for lomo, many of those images are simply done with Photoshop and unfortunately, many lomo effects are not done correctly. They simply increase contrast, add an organic vignette, and apply color effects. That is why it's always easy to tell the difference between an image taken with a real lomo camera and one with just a Photoshop effect applied.
What we will do to adjust the color is to work directly with the red and green channel to increase the contrast. This will simulate the effects of lomo cameras. To do this, we'll be using the Levels tool. We'll add a Levels adjustment layer instead of using the Levels tool directly onto the image. This is so that we're editing the image with a non-destructive method where the original image is kept untouched in case you want to see what the original image looks like without the lomo effect.
Begin by clicking on the New Adjustment Layer button in the Layers palette.
A menu will appear where you can select Levels.
Once you selected Levels, the Levels tool will appear where you can edit the settings.
In the Levels tool, click on the drop down menu where it says RGB. Select Red. We'll be editing the red channel first.
Now that you have the Red channel selected in the Levels tool, we can increase the contrast of the histogram. When you do this, you will notice the colors changing and it is beginning to look like the real colors of a lomo camera. Drag the black and white input slider closer towards the middle like thescreenshot below. This will increase the contrast. Yes, you will be clipping some details, but don't worry because we are working on an adjustment layer and not directly on the image layer itself. This means that you can always fix the settings anytime you want without worrying about losing data. When you're done, don't click OK yet.
The image may have a pink tint to it. To fix this, click on the drop down menu located near the top of the Levels tool and edit the Green channel. Drag the black and white input slider towards the center like how we did with the red channel. As you drag the sliders, you should see the image colors change. While you drag the slider, look at the image to get the colors that you want.
When you're done, click OK. Now we have a Levels adjustment layer.
Adding the vignette
We won't be adding the vignette directly to the image because we want to keep the background layer untouched. So to add the vignette, we'll add it to a new layer. Begin by creating a new layer. To do this, click on the New Layer button in the Layers palette.
You should now have a new layer in the Layers palette.
Now we're going to fill this layer with white because to apply the vignette, we'll be using the Lens Correction filter which cannot work on transparent layer. Before we fill the layer with white, make sure your background color is white. If it isn't, simply press D on your keyboard and it should reset to the default foreground and background colors.
Press Ctrl+Backspace to fill the layer with the background color. Your layer should now be solid white.
Now that we have a layer to add the vignette to, we'll proceed with using the Lens Correction filter. In the Filter menu, select Distort > Lens Correction.
The Lens Correction tool will appear. Inside the Lens Correction tool, set the Vignette Amount to -100 and click OK.
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Now your layer should look something like this where the corners of the layer are dark.
To make the vignette blend, change the blending mode to Multiply in the Layers palette. The Multiply blending mode only makes dark colors visible while light colors such as white are translucent or transparent.
Now that we've blended the vignette, your image should look like the image below where the corners are dark.
Making colors bleed (Photoshop CS2 or older)
Now we need to make the colors bleed a little to simulate the low quality effects of a lomo camera and the film processing technique. This section is for users using Photoshop CS2 or older. If you are usingPhotoshop CS3, skip this section and proceed with the steps for Photoshop CS3.
To begin, select the Background layer and press Ctrl+J to duplicate it. You should now have two layers. Make sure that the new layer, Background copy, is selected before proceeding with the next step.
If you want, you can also change the name of this layer. Naming layers will help you identify the contents of the layer. Because this tutorial doesn't require many layers, it is not necessary to change the name. But for good practice, we recommend that you do anyway. To change a layer name, double click on the text in the Layers palette and edit. Press Enter when you're done typing.
With the background copy layer selected, change the blending mode to Color. This blending mode makes the layer only affect the color; just what we need to make colors bleed.
Now we'll add a gaussian blur. Choose Filter > Blur > Gaussian Blur.
In the Gaussian Blur tool, adjust the setting while looking at the image. As you move the slider, you should start to see the colors bleed. The correct setting to use depends on the image size so just drag the slider while looking at the image to get the effects that you desire. The result should be just a slight blurry seperation between the colors.
Making colors bleed (Photoshop CS3)
If you're using Photoshop CS3, you can use smart filters. Smart filters are a non-destructive way to adding filter effects to an image.
But in order to add smart filters, the layer needs to be a smart object. To convert a layer to a smart object, right mouse click on the layer in the Layers palette and select Convert to Smart Object.
Now the layer should have a small icon on the bottom right of the thumbnail. This icon indicates that the layer is a smart object and smart filters can be applied.
Now that we have our layer converted to a smart object, choose Filter > Blur > Gaussian Blur.
The Gaussian Blur filter will appear. Here, simply click OK with the default settings. We'll edit the settings later.
If you look in your layers palette, you should see Gaussian Blur listed under the layer. Because we used smart filters, we can go back and edit the settings anytime.
First, we'll need to change the blending mode of the Gaussian Blur smart filter so that it only affects the colors. Double click on the blending mode button for the Gaussian Blur smart filter.
The Blending Options window should appear. Click on the drop down menu on the top.
Select Color and click OK.
Now that the image has its proper blending mode, we can adjust the Gaussian Blur settings while seeing a live preview of the effect. Double click on the Gaussian Blur smart filter to edit the settings.
In the Gaussian Blur tool, adjust the radius while looking at the image behind the Gaussian Blur image. If you have the Preview checkbox checked, you should see a live preview of the effect. Adjust the settings so that the colors start to bleed with a slight blurry seperation between the colors.
Finished Results
Here's the final outcome of the lomo camera Photoshop effect.
Before and after
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