I have many such "orphaned instrumentals." Some I wrote for lyrics and it just didn't work. Some I wrote and just never found a lyric for. Most are musically incomplete -- backing tracks really, -- but you CAN write lyrics to them.
If I know you are actually interested, I'd be happy to listen to what you are looking for, and see if any of my stuff could work for you.
Let me know. You can listen to things I've done at reverbnation.com/hardtwistmusicsongwriter