In reply to gchoward: well, the grivel salamanders come covered in stickers already, so...
However, I came up with a brilliant (well I think so) idea a few years ago. black reflective tape. the stuff cyclists say you should cover your frame in, etc. On the back of my (and the mrs's) helmet, I stick the tape on in the outline of the first letter of my name (A for me, J for her). This is especially brilliant for alpine starts as you can keep track of each other easily, with the tape reflecting your head torch