The original Thunder creek streamer series came from the vice of American, Keith Fulsher. In the early sixties, not satisfied with the regular head and eye size of streamers, he began experimenting and chose the reverse buck tail technique for his Thunder creek patterns.  This technique involves tying the buck tail, as the technique suggests, the opposite way and then folding it back over the hook shank and tying down to form the head. The simplicity of this pattern and the minimal materials needed to tie it, is fly design at its very best! He achieved his goal, a slim two toned body with a large minnow head that allowed for larger eyes, the main attack point for predatory fish and through changing only the buck tail colour and hook size, could imitate numerous baitfish. Streamers generally fall into two categories, baitfish imitations and attractors! I am in no doubt that the Thunder creek covers both. You can try a whole load of colour combinations, and if you would like a little flash in the pattern tie this in at the rear of the head before folding the wings back. Also if you would like a heavier pattern use lead under the head dubbing.  If you are looking for a slimmer pattern to imitate a sand eel, replace the buck tail with a synthetic material like fish hair or DNA, but dont build up the head with dubbing, this will keep the pattern slim and streamline.