It's done with that "edible lace" powder, the most famous of which is called Sugar Veil. You have to get a mat/mold and also the powder from them. I know that there are other companies now that make edible lace and you might want to search for them, but Sugar Veil is the most known.
Cake lace or Sugar Dress are much easier then sugar veil
Are those the new ones, Lynne3? I'm so far removed from cake stuff, I don't know what's the latest.
The mat that was used is from Crystal Candy and I bought mine from http://www.countrykitchensa.com/shop/icing-fondant-tools/star-lace-silicone-mat/38/770/224/645852/. I used Cake Lace because it is so much easier to use than Sugar Veil and it looked great.
Why would you say Cake lace is easier to use than Sugar Veil?
I had a difficult time getting the Sugar Veil to set/dry. I tried 3 times before I got it (once I even dried it too hard). Then I struggled getting it out of the mat. Cake Lace whipped up faster and spread easier than the Sugar Veil. I set the oven at the lowest temp and left it in for about 20 minutes. Let it set at room temperature for about 40 minutes. The lace came right out. I have just had better results with the Cake Lace than Sugar Veil. The Sugar Veil isn't as soft when its dry either.
I've bought several good mats from etsy too!
By the way....I have that lace mat too. It's very pretty....but it is NOT MATCHED end to end...meaning the next piece doesn't match the end of the last...so if you want a nice continuous pattern, you have to do a bit of trimming. That's my only real complaint with a lot of the lace mats out there.
As to mix, I prefer Sugar Dress or Clair Bowman Cake lace....in my opinion both are superior to the original Sugar Veil and can be used much quicker after prep. The Cake Lace brand even has several premixed colors such as gold that you just open the tub, stir and use!