I do 90% or more of my fishing (small streams for trout) with six patterns: three nymph and three dry. I like the simplicity and even catch a fish now and then. Being able to concentrate on tying these patterns has made me a better fly tyer as well, instead of tying one each of a hundred different flies and have a box full of first attempts. I got tired of changing the thread on my bobbin from tan to orange to brown to black etc, so lately I've been tying these six patterns all with black thread. The best I can tell in my less than one year of tying is the only part of the thread I can see on a finished fly is the head. It doesn't matter to me if it's black on all of them, and so far the fish don't care either. Does anyone else do this or do you use thread to match the body or look of what you're tying?