How do I find the Icon Asset for a place?

I know to find the the Thumbnail for a place you do: http://www.roblox.com/Thumbs/Asset.ashx?format=png&width=420&height=230&assetId=**(ID)**

But what do we do for the new Game Icons? I tried:

http://www.roblox.com/**Icon**/Asset.ashx?format=png&width=**512**&height=**512**&assetId=**(ID)**

But as I thought, it didn't work. Does anyone know the answer?

Its just random now but you can drag the image into a new tab