This little coaster uses some scrap fabric, a lid from a juice can or something similar, and a hot glue gun! ( I love useing my hot glue gun!)
Find something circular that's about and inch or a little less bigger all the way around than your lid. Trace around it onto your fabric. Cut out 2 circles.
Glue the middle of the lid to the middle of one of the fabric circles.
Then glue the middle of the other circle onto the middle of the lid, so you've got a
"fabric+lid+fabric" sandwich. Then, glue the fabric together around the edge. Lastly, if you want, you can trim it up a bit.