Idea comes from here but modded for the nano :)

And best of all, it was free to make - all the parts used came with the nano. The white part is the universal dock adapter, the apple logo on the front is one of the mini stickers, and the box was what it shipped in :P the only thing that cost me extra was the tape on the inside (and technically there's an old iTunes gift card in there to help stabilize, but it was a gift and thus also free)