If he really wants to outdo Mac's shirt, he just needs to get Carter to figure out a way to get his hair to change color in waves like one of those fiber optic desk-lamp thingys. I'm sure she could figure something out...

Can't you just see Hammond during the briefing trying desperately (and ultimately futilely) not to ask what the hell is going on with the Colonel's hair and why, lest he encourage them by reacting?