Yeah im not a fan of googly-eyed undead either, unless intended to be comical, Thayan lich protestics, or possibly as necromantic constructs...
I'd suggest giving fleshy undead types like zombies and revenants yellow/greenish, rotted, wormy or milky white eyes, and giving your various death knights, liches, skeletal fleshless undead types simple glowing energy or spiderwebs in eye sockets if anything at all...
*offhandedly* ..and we definatly need more undead with cool hats !!! '>