The BH Hare's Ear from Montana Fly Co. is a bead-head hare's ear nymph tied in size #8. The bead-head helps it sink quickly into the feeding zone.
The Hare's Ear is one of the most trusted nymph patterns ever tied — its buggy, mottled body suggests mayfly nymphs, caddis larvae, and just about everything else. Dead-drift it near the bottom. If you could carry only one nymph, this would be a strong candidate.