I sold 5 of these last weekend (avg $12-$15) at a plant show and sale my wife is involved with. I've thought about making a clock or 2 as well. They sell cheap movements for about $6 at hobby stores. I pretty much only use boxes that I deem unsuitable for instruments though (cardboard, too small, etc.). I find it to be a great use for these surplus boxes I sometimes end up with. Just got an e-mail this morning from a friend with a request for 2 more to be sold to some co-workers of hers. Not looking to get rich from it. Just a little extra $$$ for guitar parts.
By the way, I'd like to get on the list for one of those toothpicks please! Ha!