Give your guitar a temporary tattoo with this instructable. This is a very simple and fun procedure, provided you have a few things:
Guitar to Tattoo PhotoShop (or something similar) Printable Window Decal paper (avery) piece of paper (optional) scanner (optional)
This is great because you can 'decorate' your guitar without damaging the finish! You'll be able to change out your guitar tattoo whenever you like. You can slap your name on your guitar. How about a picture of your significant other? Display the name of your band. Display the name of your bird. Whatever. Enjoy!