I use whatever dave hands me.
That said, as far as tying your own, I don't tie flies, but I tie jigs...and it's the best feeling in the world, better than christmas when you were five, to catch a fish on something you tied yourself. Hell, I give my friends a bunch of jigs, and get stoked everytime someone says "oh it was on your [insert pattern here] jig", even if i'm not on the water and i get a text about it at work, it's rad and totally makes my day every single time. Never gets old.