I don't have any of these, so had to google to see what you were talking about, lol.
They remind me of the circle shaped cardboard coasters I've seen. Here is a project to make a little mini-album/book with the circle coasters.
Altered Coasters - Photo Frame - DIY Craft Project Instructions
Also, I had the thought you could cover them with pattern paper, embellish, and use for Christmas ornaments.
Cover and embellish a bunch of them and string them together for a holiday banner to hang across a mantle.
I agree with you - I wouldn't be able to throw them away either.