There was a 9th level adventure printed by Penumbra Press, written by Monte Cook (how much more cannon can you get than the man who designed 3rd edition?
), "Beyond the Veil" I think it was titled, that dealt with a Ghost Young Adult Black dragon. When you finally get to his lair, it is filled with half-dragon... everythings. (It was described that before he died, he was a little... overactive, in the breeding department.) There were half-black dragon drow, half-black dragon carrion crawlers, and other things, too.
But Braininthejar's example was actually published by WotC, so there you go.