My Attiny13 controlled rover.
As you can see this turned into quite the interesting project. About the size of a deck of cards and about as minimalist as you can get, this rover pushed my skills just a little further.
I love it, you should too.
If you'd like I can post more about it, such as how to and what not. Just I'd probably have to make another one to explain how I did it. :P
Let me know what you think.