Here's a link to criss-cross coasters:
http://patspattering.blogspot.com/20...other-way.html
To make potholders you just increase the size of the squares to 8 or 8.5" and add a layer of Insulbrite to the interior. These are folded on the diagonal, but you can also fold them parallel to the cut edge. Just be sure the folded edge is to the inside of the square when you assemble - all raw edges are on the outside.
Darren