Well I chose the fabric from my stash, a Kaffe Fassett, and cut out most of cardboard I had on hand. Can you believe it...I ran out of cardboard with the 6 lining rectangles left:(
I will go out tomorrow and look for more. I think what I used was matting board.
I was thinking I would make a template out of freezer paper to cut the hex's out of the fabric. I hope to make them for my nieces, after I make the first one :)