In my last session, the player characters defeated an adult black dragon and it was a lot of fun. At the end of our session, I told them I'd figure out something fun to do with the corpse. And by fun, I mean let's make some magic items. So think of what parts of the dragon you might use to make a magic item out of. Don't worry about what classes I have in the party or worry about the rules. Just think of this as an exercise in fun.
Armor from its scales?
Something from its horns?
What about it's organs?