For Barn Star, I used pieces of foam board. I make my own design boards using a no hot glue method as they finish much nicer, IMO, and I can make them large enough to lay out these large blocks. A couple of them right sides together store finished blocks. If I am traveling, like to a sewing day or retreat, I lay out some blocks on my design boards, one more board on top of that with finished blocks, and another upside down. Then I tie a long length of grosgrain ribbon around the stack (it's about 4" tall).