Hi A-D,
Many parts of the turkey are very useable and I often substitute the tail feathers for pheasant when tying nymphs with wing cases. I have used the metailc copper looking feathers in addition to rams wool for wool head sculpins and as previously mentioned, have also used the marabou portions for buggers etc. I would assess your tying needs before you dispose of the feathers and I would also be VERY careful about isolating the feathers from your other tying supplies.
Be sure to clean them thoroughly with a dawn dishsoap solution, dry them and then put them into a ziplock bag with mothballs and the whole bag inside a rubbermaid sealed container for awhile.