My two personal favorite plastic worm fly patterns are Hare Worms and Gulley Worms. You can find illustrations of them in most flyfishing mail order catalogs (Orvis, Cabelas, Dan Bailey, etc.) Caught my biggest flyrod bass (a 21" four pounder) on an Olive Hare Worm. She short lined me just as I was getting ready to pick-up and make another cast. Scared the you-know-what out of me! Gotta love the savage strike of a bass that thinks something is about to get away.