A few, even several stickers will make no noticeable difference in the sound. You'd probably have to completely cover the guitar in multiple layers of stickers to really affect it. On my "beater" acoustic I have a round fish-eye mirror (like on a side-view mirror) stuck on the front. WHen someone asks what's that? I say "look closely... it's you!"...
WHOAAAA, DUDE... 
Last edited by tigerstrat on Sat May 26, 2007 7:11 pm, edited 1 time in total.
"There, in huge black letters, was 'The Grateful Dead'. It just... cancelled my mind out."-Garcia