I think I would like to have some large sized cubes that I could stack in different shaped piles, and if those cubes actually looked like my buddies in cube-shape, that would be good too. That would be some intelligent stacking.
Maybe that should be an advanced skill...turning one's avatar into a geometric shape. Then you and a crack team of shape-shifters could go to Out of Reach Street, and stack yourselves while one of you climbed up and claimed a prize that everyone could share.
Failing that, some furniture shaped like my buddies would be just as good. Like a striatic chair for my house.