Pantone Coffee Mugs
I want one (or two) of these so badly for my desk at work. Unfortunately, they are sold out, unavailable for U.S. customers, and it looks like you have to buy them in sets of 10.
*01/20/08: There are now quite a few sites that offer the Pantone cups individually, many of which are different colors than shown above. The sites are all UK based, but some of them ship internationally. They are marked up in price, but that's ok with me, since I didn't need an assortment of 10 different colors. From drop 365, bloomsbury, blackwell, and tate.