Making shrinky dinks is not just for kids, although they would have fun making them. This site has a good tutorial, but you can just buy a package (six sheets per package) at your local craft store, instructions included.
These are Downton Abbey characters downloaded and printed on to the special paper (remember to dull down the colors as they become brighter once they are baked).
They are stitch markers used for knitting up this sock which is in progress. Sock pattern here.
Linking to WOYWW.