Below is a cover I made for my brother, who recently wrote a book about buying stock options. The books is good and easy to understand. If you're interested in options, check it out at:
http://www.amazon.com/Trading-Stock-Options-Option-Strategies/dp/1441490418/ref=sr_1_12?ie=UTF8&qid=1248586393&sr=8-12
Here is the cover (the actual picture, not the text and title):

I made this one in Painter X. I'm working on another cover for him as well and I'll post that up here after his new book (about making a home-based business selling things online) is done.
In other news, I'm converting one of my film scripts into a comic script right now. Once I hire an artist for that I'll post some stuff!
Later!
-Matt