Some easy stone fly patterns?

How about a Montana Stone or even a wooly worm.
If you do the Montana use brown and pale yellow in a size 10 to match the local yellow stones we have here in CT.

I make mine from just rabbit fur.
I wrap the hook with lead and flatten it with pliers. I use a pinch of fur for the tail, then dub the body with more fur in a loop, finish the head, and brush the body out with velcro or a tooth brush.
Very simple