While the Imperial AT-AT Walker was designed as a war machine on legs, it really ended up being quite a flop due to its fatal design flaws. That said, AT-ATs do make pretty cute pets, if you housebreak them. They also work great as bookends if you cut them in twain.
These fun AT-AT bookends come courtesy of MokuShop, and are made from 24 pieces of hand-assembled, laser-cut and engraved wood. They look great painted up in metallic silver (shown above), or left alone as natural wood. They also recommend attaching a leash to them, so the dark lord can command the walker to follow wherever he goes.