Tight, check out this really cool M&M Line Trace Robot! It’s awesome! They should sell these at M&M stores. (I recently bought a M&M sculpture for my dad’s birthday but this is even better!)
For the holidays, my local grocery store sold m&m’s candy containers in the shape of a racecar. The containers are painted metal (probably steel), with a thin plastic coating on the inside. A dinky package of plain m&m’s came inside, not peanut, as the yellow-color driver suggests.
About this same time, the ChiBots robot club began discussing holding a robot line-following contest. Naturally, the colorful candy tin seemed like a perfect body to motorize and drive around the course.