I can understand what your saying here and alot of the time the painters don't get enough or even any credit for doing the work, I've only seen a few people actually sign there work and they all look good and don't interfere with the paint scheme.
I've seen a couple of Jons with the small RCS logo in the front grill that looks superb (not sure if they were stickers that were supplied or painted?)
http://www.oople.com/forums/showthre...=49790&page=20 .
Also theres a couple on rcnet that always add there name usually the top of the front window.
As long as they look good and aren't too big I don't think anyone would really mind, though stickers are a good idea and then they have a choice in whether they put them on.