They look like a jaconde.
try this link:
http://modernbaking.bakery-net.com/article/6566
That's exactly what it is. And those texture mats are not cheap! You can still do it on a silpat though.
Amber
I was going to say a collar of thoughts but after reading 7yyrt's link on the jaconde, I agree that it looks like that for sure! 
Here's another link:
http://www.frostatiers.com/demo2004june.htm
It seems to be pancake thin layer. you bake it and line the pan with it and put your cake and fillings inside. Take off the pan and it looks like the picture.
you take the jaconde batter and mix in chocolate for the color or some food coloring. I used a painters tool (those that do faux finishes on the wall) over the batter once it is on a sheet pan. You have your cake layers filling or whatever you are using. You cut a strip of Jaconde to line a round pan springform is easiest. You layer your cake and filling or whatever you are using and let it set up and remove from your pan. I hope I didn't make it sound too confusing. It really isn't that hard.
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