The following is my first successful photo manipulation. I don't make a habit of it, but it can be an excellent time waster, not to mention loads of fun. When viewing this, bear in mind that the car, the running man, and myself were not in the original image.
Here's another that I did for a few of my artist social networking sites. Profile pics for them. Speaking of which, if you are an artist, I would suggest registering for an account on talenthouse.com. And if you would just like to advertise yourself and what you do, I've become addicted to about.me as well. Bear in mind, it's not centered or cropped appropriately because I had to form it to a web page background.