I found this amazing Site (Its still small, but the concept is cool) That is like a myspace for people who like to make robots. I thought that it was pretty cool; there are also instructions for beginners on how to start making your own robots.
Here’s on of them:
“The Yellow Drum Machine” Is a small robot that uses sound that is pre recorded and sound that it play’s, records and then plays back to create unique rhythm compositions. The cool thing about this robot is that it will drive around, find an object and then using a set of drumsticks attached to motors will play a rhythm on that object. For me, really captures where I think the next generation of Robots is going. The idea is simple, small, and fun, something that will sell.
It is very interactive with its surrounding environment making it more marketable.

That said when you go to the link there are instructions on how to make this little guy for only $120.