I suggest the pattern below rather than foam patterns for the reason below. Damsels get blown into the waters and drown. They go under water to lay their eggs and trout frequently take them under the surface. Foam limits the ability to imitate this phase of the damsel's life.
Borger Damsel
"One question that I/we often get about this fly (inspired by a pattern that my father saw in New Zealand back in the 1980s) is, ?Why don?t you use foam for the post, it floats better?? The answer is based on years of observing damselfly hatches and is fairly simple: because sometimes we want the fly to sink. If that sounds odd, keep in mind that ?dry flies? (or perhaps more accurately ?dry insects?) sometimes aren?t so dry?."
The video below shows how damsels are vulnerable when they are under the water and how they get trapped in the film. A foam damsel pattern can't get that trapped in the film appearance.
Egg Laying Damsel Video
Regards,
Silver
"Discovery consists of seeing what everybody has seen and thinking what nobody has thought"..........Szent-Gyorgy