Hmmm...okay, first tut. Let's see here, this is really easy.
First, take a color picture, any picture will do. I will use my eye for this
Copy and paste that pic onto a new layer.
Add filter Gaussian Blur @ 3.0
Change layer to darken.
And there you have it!
Here's another one, a bigger one so you can see the results better.
Original
Comic-a-fied
this one had the gaussian set at 6.0, so there's a lil difference. Just mess around with the amount you want.
Remember, if you have a crappy picture, you'll have a crappy result.