get some gigs at the dives i've played. smoke will yellow it right up...
sharpie makes some wood toned markers now, the lightest of which, if thinned some sort of way, could give you a "parchment" like color. sharpies are of course, permanent, so it shouldn't wipe off. i have of course, not tried this, so i'd experiment before ruining a good p/g.
honestly, my best advice-- buy a fender mint green. they look sooooo good.