I can't imagine that there are many tiers out there more inept than I am when it comes to working with deer hair for the purpose of actually creating a recognizable object; for me, it's foam, specifically the live body foam typically used to make bangers. For crease flies, obviously I use foam sheet, either the generic white stuff purchased at a craft shop for less than $1 per sheet, or else the foil-backed foam available through tying shops. I use bucktail for the "wing" sometimes, though just as often I use yak hair or maribou. Poppers are without question my favorite pattern to fish, as there's no other way of fishing I can think of that's as thrilling as having fish crashing on top. As far as colors go, my all time favorite is red/white.
So for me, the popper material is synthetic.