We've been saving the colored caps from X's food pouches, and I've been trying to think of ways to use them because they're so nice and bright. I've seen these tin can robots a few times online, and when I went to Lowe's to pick up safety goggles and a hammer for S for her plaster excavation, I was surprised to find how inexpensive nuts, bolts, and washers were! For just a few dollars I was able to get a variety of robot hardware. Next up, I bought some round magnets.
Full post: Recycled Robots