I first saw this style of pattern tied by Gordon Fraser, back in the early 80s. Its a very versatile pattern - but first the recipe:
Tail: Olive Marabou
Body: Olive sealfur substitute dubbed
Hackle: Grizzle dyed chartreuse
Rib: Medium Gold
"Eyes": A pair of close-cell foam balls (I couldn't find the real thing so used cubes roughly trimmed), encased in a piece of nylon hose eek: yes, thats right, I said HOSE). Colored with Pantone pen.
Back when this pattern was slaughtering stocky rainbows on the English reservoirs, polystyrene balls were readilly available in fly-shops, You still see them used in packing material sometimes.
The secret is how they are attached. Encase the two balls in a piece of hose and pull firm but not too tight into a sort of mesh bag. Now lash the bag to the top of the hook-shank with the tag end pointing towards the hook-point. Trim away the excess hose material. Finally, figure-of-eight between the balls to "Lift and Separate" as they say in the trade (this will tighten everything up. And thats why they are called "Boobies" if you hadn't already guessed I used a coat of softex to add durability. Test any glues or cements first on a spare piece of foam - lots of things will melt foam.
You probably wont find hose material in a flyshop. You could buy your own or ask your girlfriend or wife - be prepared for some strange looks! But its worth the embarrasement!!!
Using a single ball you can creat suspender nymphs or how about the dreaded clam worm to dimple the surface?
You can mix and match almost any materials which take your fancy.
There are a number of ways to fish the pattern.
As a floater, its not quite as noisy as a popper but still creates a nice surface disturbance. I chose damselfly nymph colors for a figure-of-eight retrieve or static drift. Last and probably deadliest is to fish it on a fast sinking line and very short leader (no more the 3 feet). Short strips with a pause will make it dive to the bottom and rise seductively - like a clouser in reverse. If you should put your rod down whilst the fly is sinking, keep your eye on it - takes on the drop come frequently and can be very agressive
Apologies for being a bit late - should make the post on Tuesday.