The tip is to gather enough "stuff" that you need to have two of those three drawer rolling things that all the big box stores sell. Then you butt them up against each other, and store the mats, standing up, in between.
Or, if you have a knee space in your sewing area, as in a desk w/ sewing on top, put one of the rolling thingy's against the knee area, all the way to the back, then put the mats between the thingy and the desk.
I really have to get the camera back from DH (and charge it, probably) and get some pics...
But I think the real trick is to get enough stuff together first.