I had this leftover Cardstock and I made a little notebook out of it, using these instructions. It is 6 1/2 by 4 1/2 inches large and contains 20 sheets of paper. The paper has a 5 by 5mm graph on one side and is plain on the other. I will use it to write down my knitting notes. The graph paper is neat for making a little chart.
I think, the Cardstock is really pretty. I got it in White Rock at Country Lane Crafts. I will probably add a protective sleeve out of clear plastic and maybe a penholder. It fits nicely in my knitting bag.