Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
I don't feel quite so bad about not taking pictures that cool when I read about all the fancy setup he did to take them in a studio setting, rather than in the wild, but I also agree with his argument that that's a legitimate way to make some awesome artwork.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist