Tig,
There are quite a lot of "delta wing" patterns around.
I think Gary Borger's "yarn wing dun" pattern may well be the most imitative of the natural. There is, however, a large school of thought that since the tips of the wings are the first things a trout sees in its "window of vision" as the fly floats towards it, the upright wings provide this representation better. We have to remember that the trout do not see insects or flies as we do.....from some 3-4 feet above the water!
My, not the greatest, example of Borger's pattern:
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