The Woolly Bugger is likely the most commonly used streamer. With a gold bead head to get more water depth and a bit of flash to get the fish's attention, the Crystal Bugger works well either dead drifted under an indicator or stripped like a streamer. Purple available in sizes 10 & 12; black peacock in sizes 8 & 12 and olive in sizes 8, 10 & 12.
TIP: In off color water, try fishing this fly under an indicator, behind a large nymph. Let it swing at the end of your drift.