I finally arranged a flat place to store my rotary mats, the ones you put blocks on to square up the sides without moving the blocks. Thanks all.
I am starting my log cabin quilt now and I got out the jelly rolls I planned on using. I have had them for about a year. I was surprised that the inner rolled strips were creased and crunched curls so much from being rolled up. Though I probably shouldn't have been. But, with most of the jelly rolls I use just after they come out in a fabric line, I don't see this. I'm wondering if it is because they were rolled up for a long period of time. I'm thinking I might unroll all of my older jelly rolls and store them lightly folded in half instead of rolled, and lay them flat in a container. And do it for new ones as well. Letting the fabric breath some instead of being tightly rolled up.