My husband made mine using foam insulation board. I covered it with polyester polar fleece. I don't have to pin my blocks to it. If I use a little pressure as I smooth the block on, it sticks just fine. That being said, my dogs have been known to get a little rambunctious and then they all fall off!
I posted a pic las summer. I am trying to post the link to the pic.
http://www.quiltingboard.com/mission...l-t195693.html