Glyph of the Necromancer (Warlock)
Demonic Pets transform in to their Undead counterparts (armored skeletons, Nerubians, Mini-Bone Giants etc).
Glyph Of the Guardian of the Naaru (Paladin)
Guardian of the Ancient Kings transforms in to a Naaru instead of an Angel. Wings During Avenging Wrath are wings made out of Crystal...(imagine challenge pala set).
your turn
Post some cool cosmetic ideas