To celebrate the fact that I actually hooked and landed a fish on this pattern, I've decided to post my scum fly. This fly is the most weedless pattern I have ever fished and handles beautifully through pads, bullrushes, and all forms of surface "sludge".
Hook- A size 2 light wire stinger hook (I like mustads for this) keel weighted with some light wire
Weed guards- 3 strips of closed cell foam in which the point of the hook can be buried
Tail- Splayed grizzley and olive neck hackles
Collar- Olive bucktail
Head- Natural and olive deerhair clipped like a very bushy dahlberg pattern with white rubber legs
The key part in this pattern is the keeled stinger hook. My thoughts are to better avoid having to bend hooks, the pattern woud be better tied as a tube with an inverted larvae hook like a mustad 37160. As for the design of the head, I found the diver style head best for sneaking around the weeds and yet still being able to push water or even "pop" over holes.
Pictured are the actual fly and its chassis