Weightless flies for grass and tailing fish are easy to tie and anything that looks half like a shrimp, swimming crab or minnow morsel will do it.
Just take a little cheesecloth net and scoop up a bunch of critters and spin stuff around a hook that resembles them.
It's mostly about presentation on the grass as you might already know. Soft landing, having it down enough so they come up on it in easy reach, and having it suggest food.
IFFF Certified THCI @ 2005
Capeflyfisher Guide Service
Island Hopper, Guitarist, Incurable Dreamer
and Founder, Worldwide Flyfishing Forum