These are examples of patterns using a method of tying made popular by Marc Petitjean. They are made entirely out of Cul-de-canard, save the tails. To form the body trap a CDC feather tip first at the bend of the hook, before twisting it to form a round cross-section and winding on to form the abdomen. Due to the nature of the feather this produces a nicely tapered body.
The wing is a little different to Marc's pattern, as it consists of a spun and clipped CDC hackle instead of a bunched split-wing. It is a better floater than the original, although the split wing version is a little more realistic. Flip a coin, they're both wonderful patterns.