I started working on small robotics projects during my university (URI). Most of the work was with Lego Mindstorm. Here is a link to the project Sweet Tooth. The robot started looking like a elephant first and the trunk/teeth had the touch sensor which made it change direction when touched. You can read more about it on the page. The project ended up being a six legged transformer type robot which would change into a three wheel bike and drive away when someone/something hits the bumper.