I tie a simple pattern (for good reasons) that consists of a body made of folded over black sheet foam, red plastic bead chain eyes and orange Krystal Flash for a wing. It takes about a minute or two to tie, floats great and is durable.
I keep it simple because the fish are not particularly selective when they are on them. Another reason is the hype and "emergence" maps can be very misleading and you can spend way too much time tying an imitation of a bug that won't show up where you are fishing...