Here are some disparate three-dimensional things I have made:

This is a concrete planter (with no plants yet). It weighs about 300 lbs. so I'm waiting for a friend to unwittingly come by and help me move it.

This is a little carved, painted wooden elephant I made a little while back.

This is a house form (which I have made variations on over the years). The doorways all connect to each other and to a trapdoor hole out through the bottom.