Anyone heard of these? Well if you haven't, it's pretty cool.
Go to www.pixelcarlife.com, create an account to access their bases in their forum, and you're set. Funny thing is, the folks on that site have actually turned it into an entire game (some people have no life, lol). But they're fun to make if you have some spare time.
Use Paint so that way you can edit it pixel by pixel. Photoshop just doesn't cut it (trust me). Or, if you want something better than Paint but is also close to Photoshop, get Paint.net. Download the program here for FREE. Totally free program, you don't have to pay a dime. http://www.eecs.wsu.edu/paint.net/
Here is the one that I made: