I use my leftover eyelash yarn to make anklets. Use the eyelash yarn for the cuffs (1 1/2" to 2 1/2" depending on the recipient) then change to a solid color sock yarn. Anklets really stretch your sock yarn too. Only problem is....I'm out of eyelash yarn and have more requests for socks.
Gosh, you will have to buy more yarn! Have you ever noticed that in the process of using up yarn you wind up buying more yarn than what you were originally trying to use up? I have this down to a fine art.
Whether you think you can or you can't, you are probably right.