Practically anything you like mate... don't forget about winding stuff on for the thorax, rather than just dubbing. For example.. pearl mylar makes an effective PTN thorax, especially coupled with with dyed black pheasant tail and a fine silver rib. Wire is an option for the thorax too.. try some copper for an extra fast sinking nymph. Then there's spanflex, peacock herl, glo-brite floss etc etc etc.
As far as furs and dubbings go, seals fur is an obvious choice, as is rabbit or hare. The sky's the limit. Why not try sparse mixes of dubbing over a glo-brite or pearl thorax base? Have fun