Miyavi looks freaking gorgeous in his blue hair from the Jibun Kakumei PV. Seriously, I wish he'd kept it. D: I could've mauled him all day. (Still can, but anyway.)
My least favorite is, sadly, his current one (at least, I think it's still current?) with the shaved off side and braids.
He looked good in the black hair from the MYV POPS CD cover, too.