Lighting at
http://superbrightleds.com/ is pretty good. Their RGB bars can produce some astounding color effects.
OK, when you're done pimping it up, how about a nod to practicality? Our cart is made from 1.5" 80/20, with a Craftsman 3-drawer tool chest* on each end. This leaves about a 16" space between for batteries, gloves and such. Advantage is you always have all your tools with you (big advantage in semifinals and beyond), disadvantage is you have to keep it neat and orderly. Doubles as a crate carrier on load-in and load-out. We use short (8") pieces of 80/20 installed vertically to support the robot so it cannot fall off.
*The kind that usually goes in the middle, no top hinged lid, with "griplatch" drawers so they don't slide open by accident.
EDIT: Our also fits inside a standard bus luggage compartment when we move the handle (2 screws)