In case you haven't heard, Asus will be releasing a line of official accessories.

These include mice (in all colours including white, black, Blush Pink, Sky Blue and Lush Green), headphones, spare adapters, and a reported 6-cell battery.

See official site: http://eeepc.asus.com/global/product.htm#acc

So far only the spare adapters can be found at the ASUS eStore (do a search using the term "eee").  These are available in black and white.