If they were a 'without strings' gift, you could sell some of the tops on Ebay or in the selling section here, then you'd have money to finish your favorites.
You could also back with flannel and make toppers and throws out of them.
If you absolutely love them put up a pretty curtain rod and hang them folded across it
A gift isn't an obligation. I expect they feel great having given them a good home.
All my quilts are double sided, that would cut by half or more, the only expense would be the batting