Does anyone know a good source of impression mats? Especially the longer ones ...say 11x14? I saw some on ebay but they are really small and after reading the comment from Sugarcraft...well, looking for other options! I am specifically looking for a diamond pattern.

People speak very highly of Cakes by Sam:

http://www.cakesbysam.com/store/cart.php?target=category&category_id=263

And Country Kitchen Sweet Art:
http://www.countrykitchensa.com/catalog/product.aspx?T=1&productId=626652

They also carry the Geraldine Ransom series of oversized lace mats:
http://www.countrykitchensa.com/catalog/product.aspx?T=1&productId=627432

I went to this huge bead store and they had some clay impression mats and I bought a couple and they have worked perfectly on fondant

I have one that gives an embossed leather look and the other one is flower-ish.

Just an FYI.

you can also try

http://www.earlenescakes.com/store/impression_tools.html

http://www.globalsugarart.com/cat.php?cid=673

http://stores.ebay.com/Sweet-Expressions-Silicone-Molds_Impression-Mats_W0QQcolZ4QQdirZ1QQfsubZ19QQftidZ2QQtZkm