I hang my mats on a nail in the wall. I put my rulers either in a wooden holder I bought for them or on a nail in the wall.

www.joanns.com sells a June Tailor "Rule your Rulers" that will allow you to attached your rulers to and hang in your closet. It is a circular hanger and is on sale now for $2.99. I have 4 of them in my closet to hold all of my rulers for easy access. Also, I bought an Omnigrid mat storage that is similar to a portfolio case and this holds my mat in a zipper compartment with other compartments to hold my rotary cutter, scissors, etc. I also use this Omnigrid to take my mat and accessories with me to classes.

I'm glad you asked this. I didn't know about the warping if you stand mats on end, which I have been doing.

I have two grids to set my rulers in and the mat generally lives on the sewing table.

OOOH that is a great idea!! :D Im going to steal that one!

My rulers stand up under my table, my mat is on the table laying flat.

My large mat stands between the wall and my cutting table. I have the large, circular rings that open (used them many years ago to hold floss on little plastic cards when I was doing cross stitch.) I open them and hang my rulers on them and then hang them in my sewing closet. Works perfectly.

My Mat is always on my cutting table. I have been looking for someway to store my rulers over my cutting table, I don't like the ones that sit on the table. While at the Road2Ca this past week I found the ruler holder that can sit down or be mounted on the wall and it also holds the big square rulers in the back. I love it. Here is the link, he has all sizes. Mine was $39, but if you have a handy DH, he could make you one.
http://www.romwoodworking.com/

What an awesome ruler rack!! NICE!! :thumbup:

How creative, I love your idea of making your own storage for your rulers.
My huge mat is alaways on my cutting table the smaller mats & most used rulers are in a office letter divdiver on my cutting table, the rest of the rulers & templates hang inside my fabric closet.