I was browsing in the dollar store and discovered that they carry cheap dusters made of an interesting material.
This stuff is amazing under water! Stiffer than marabou feathers, but not as stiff as bucktail. Color shows up well, and the lure has a pulsating shine.
Try it for yourself - it's only a buck. If you don't like it for streamers, you can always use it to clean the house...