The Timbuk2 bags, as well as the CrumplerUSA bags are all pretty bad colors, unless I were a bike messenger.

Er, the Crumpler link has lots of colours and Timbuk2 are all custom made to your choice (eg. blue/silver/blue looks great). I bought mine from the only place in the UK that sold them at the time and only had a choice of two (something awful and "plum").

Gareth