Well, I can agree with Rip about them not having to look good for catching fish. But, if you intend to "display" them, you'll want them to be as nice as you can get!
Pat Cohen ties some of the best & artistic deer hair bugs you'll ever find, so I would check out his flies. Pat has a website & sells some of his flies.
Ronald P. Braud, in Prairieville, Louisiana does some of the nicest looking poppers I've seen. He's on some of the fly tying forums with the user name "Stippled Popper." I'm not sure if Ron sells any of his flies or not. Ron had written an article about some of his work. Check it out. http://www.flytier.com/stippled.pdf
I like to think that I make some nice poppers as well, but I haven't made any to sell in about 10 years. Just don't have the time these days. I'll have to check my fly boxes & see if I have any that are "purty" enough to display
You could also check "breambugs.com" which is a retail site that sells primarily warmwater flies & particularly poppers. They have a good selection, but most are mass produced, commercial bugs.
My mind doesn't always work right, but if I think of any other people who make some nice bugs I'll add them here!