Hey, I could leave my tri number sticker on my bike. I've seen folks do that. (ummm, I kinda thought it was tacky... but now that I might be getting one next week I'm starting to think it could be cool)

Depends on how cool the number is.

Pyxi- How about one of those little band-aid stickers they sell in motorcycle shops? You could put that on your top-tube dent. Some have phrases on them, too.

(I had a bandaid sticker that said "Stupid Hurts" across it, and loved it! Stuck it to my car.)