You will need a streamer hook (#10-#14), olive marabou, plastic bead chain eyes (green) and some 2-3mm thick foam cut into a suitably wide strip. Adhesive backed foam is easiest to use in this case. Tie on a marabou tail (use the method shown in this months fly tying tip, and tie the shaft on top of the hook shank). If you would like a more buoyant fly, loosely tie a small strip of foam above the hook shank. Loosely, as in 'don't throttle all the air out of the foam'.
Take another piece of marabou and tie its tips just over the tail you have just created, and advance your thread to the head.
Holding the marabou by its 'handle' wind it around the hook (or spin the vice) till about a third of the shaft length from the eye and fix it there.
Cut a 'V' into the front of your foam strip ( I have use chartreuse here, but white will be fine)
and tie it on adhesive side up as shown.
Make a fold in the foam and tie it down as shown. If you want to add legs, this would be the time to do it.
Wind the balance of the marabou forward, tie off and trim.
Tie in your bead chain eyes, tightly against the foam, and secure with a figure-of-eight wrap.
Fold the foam over the eyes and secure tighly against them. Whip finish and trim. Your fly is now complete and just needs some colour dabbed onto the foam.