I used LOLCat Buildr to do mine, but you can use any site that will help you make a LOLCat.
Here's the directions:
Take a picture of a cat doing something cute. Then make up a caption--something witty that the cat would be saying if cats could talk. Bear in mind that cats can't spell all that well and that they're not so hot on subject-verb agreement either. Photoshop the caption onto the image, and post your creation on a blog. What you get is lolcats: lol for laugh out loud, cats for cats.
In case you were wondering, the above is my Maine Coon cat Michael!