Ohgizmo reported that you can now build your own robot out of items that you might have around your house. Ok, some you might not like a servo and resisters, but in general this can be built in the home with parts easy to find.
Now dont go expecting that this will take over your life like on iRobot, but it's still a fun little project to make. It's not for the beginner though.
Via: OhGizmo Instructions at Coat Hanger Walker