Today I used a Tullis Wiggle Bug. The water was a bit deep from the rain, so I put a split shot about 8" up my leader.
My brother has access to his neighbor's containment pond, which receives no other fishing pressure. >hand sized bluegill take #4 Stimulators with a vengeance (How do you like that, Tammy??)
In general, sunfish are extremely aggressive - especially when on the spawn (which is all summer) - and very competitive against one another. If it will fit in their mouths, they'll hit it. Surface flies and sight fishing are best. They come up and stare at your fly, and you can see the gears turning in their little brains - telling them "it's not real, it's not real" before they say "What the h@ll" and hit it anyways