We bought a little stacking toy train for my son, but some of the blocks were missing (it was from a garage sale - nothing but the best!)

I thought I'd just replace them with Makerbotted parts, but figured that as long as I was going to print the parts, I might as well customize them. It ended up turning into a set of custom parts: a block with an octopus on top, blocks with his initials and his Chinese name in the sides, a block with dimples on the side and a cylindrical shape which I like to think of as a container for nuclear waste.

Print with a profile that handles overhangs well. I found .25mm layer spacing on the Thing-O-Matic worked well. Cubes seemed to print fine on a cupcake with the default profile.