Vehicles that move

We are starting our next big science unit, building a vehicle that moves. Today we watched some videos to see some examples of vehicles. After some discussions, each student sketched out a plan of the vehicle they intend to build. We will be doing most of the building in class. I am looking for some building materials to have available in class.

Possible building materials:
Plastic bottle caps - any size
Plastic bottles - any size
Cardboard
Any jar lids or wheel like items
Old cd's


Thank you!