On your foam flies, use some glue- superglue works well. This makes them more durable and keeps the body from spinning- which is annoying and hard to avoid without either cutting the foam with the thread or using glue. I pretty much only tie foam dries- I mean, what is better than foam for a dry fly? It floats with no floatant, its cheap, it looks good. Foam caddis, foam hoppers, foam stoneflies, midges with foam wing cases etc.