[Xanderfox]

Try combining cursed items with magical items with positive effects, combine the girdle of giant strength (stand strength buffing item) and the girdle of femininity (makes male wearers become female). Finally don't be shy about making up your own transformation curses, a set of cursed elven chain that belonged to a busty female warrior and gives the wearer her body for example. A ring of flight that gives the wearer wings rather than allowing magical flight. Just because it's not in a book or been created already doesn't mean you can't do it, remember your the DM your GOD in your game.