In the instructions for my King Tiger (Ardennes Front), it mentions briefly that some units applied red brown and/or dark green camo to their bikes; Does anything go here, like German armor, or was their a more standard form?

Mostly on the german armor, it was up to the tank crew to paint the camo. same with the bikes. pretty much all they gat was the tank on bike in the standard color of the time. panzer grey or a dark yellow, and some dark green and red brown paint.

I already knew that, I guess I should re-phrase that question. Does anyone have any pictures of bikes w/camo?

Sorry about that. :-)
try this site out it should help you some....
http://membres.lycos.fr/panzermaniacs/html/archstoss_motos.htm

These are the only color ones I have found, all the rest was B&W.

I can scan the box art from the Tamiya Motorcycle rider kit if you like. Drop me an IM if you need it. It is in camo.