Why should rock chicks have all the fun? For two years, L.A. designer Allison Burns has paid tribute to musical goddesses with vibrantly colored leather bags that sport names like Jett and Faithfull. Now guys can get into the act with belts, guitar straps, and, yes, a Zeppelin man purse (a.k.a. ''unisex messenger bag''). Fans include Dave Navarro (left) and Michael Stipe -- guys who, says Burns, ''have a bit of spice in their wardrobes.''