There are impression mats you can buy. Some even have the scalloped edges on them like that. Ebay has quite a few of them pretty cheap with buy it now options. I don't want to suggest one since I have never used one before.
does it have all the holes like that or just impressions?
You can get a silicone mold that will have the holes or an impression mat that will just have the impression on it.
any links to one of the silicon mats? i cant find any bigger than just a tiny piece of "lace"
One, possibly both, cakes were made by Sweet and Saucy:Â http://www.sweetandsaucyshop.com/wedding-cakes/fondant-cakes/
You could get in touch with them and ask how the lace was done.
It's possible that they used a real doily, pressed it into a molding compound (such as Amazing Mold Putty or similar).. Then when the mold hardens, you press gumpaste or fondant into it.
Some of those may be sold by the time you read this, but I just searched eBay for "doily."
Also see this: