Not my fly for this swap, but my favorite fly for dollies during the chum spawning period. It just tumbles along the bottom like a real egg, and a little marabou as a tail or wing only makes it better.
Makes me hungry just looking at it
I recently used an old pattern I had in my fly box that looked similar to that, but had some strands of white coming off to give it some fleshspawn appeal as well. Worked great on SRCs when salmon were around this summer.