Neon was the buzzword this week, landing on nearly every runway. But a few crafty designers reinterpreted that late-eighties trend into something distinctively more punk. Anna Sui used bright pink, blue, red, and purple hair extensions to jolt people out of their seats. Marc by Marc Jacobs sprayed his gals' hair red, pink, and even blue. And the eyes had it at Zero Maria Cornejo, with lime green, tangerine, electric-blue, and hot-pink shadow applied from lid to brow.