Thought I'd give this idea a go. Tying on the side of a 400T swimming nymph. This weekend I turned a few stones the the river in the photo and found some big stonies. They way the curve when they crawl and curl when they free float inspired me to try and capture it. Not sure how the hook-up will be having the hook on the side, should be OK. My mate Jack bent his up into some unusual positions with pliers and they still worked. These stonies have a yellowy orange on the underside which I penned in. The suggestion of gills were made from yellowish CDC.