Nick,
I like that idea. I've got a few other ideas in mind that I need to crank out.

Another tier on another forum I frequent cuts his tubes at an angle the adds a round sequin to the front of the fly. When stripped in it give the pattern a diving and erratic action. I plan to play around a bit with that as well.

I played around a bit more today with the round Rainy's foam. I like the look better with both ends of the foam tied down.
This one came out at 3" in length.
SF