here’s a super-sweet, superbly tied Blue Dun imitation by 0031flyfishing
very much inspired by Marc Petitjean’s methods of working with cdc, following the basic guideline of this great tutorial and varying colors, sizes, omitting the red tag or not will lead to an extremely good generic imitation of just about any of the bazillions varied creatures of the Ephemeroptera (mayfly) family. *

crank up the volume and enjoy !
* (and more or less any other bug that has wings, a body and a tail…
)
for more info on the natural insect click the pic to access troutnut.com‘s page.
That is some FINE fly dressing