Help! I know I have seen these cutters, but can't remember where? 

http://rouveleescreations.com/ and it's the bottom on this cake.  Thanks

There are quite a few cakes on that link. Can you post a pic or describe please?

Center black cake on the bottom tier.

HI, Is it this one???  

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=171192958499&ssPageName=STRK:MESE:IT

Yes it is the cutter!  

I know this cake (made in 2011) and the person who created it (Rouvelee)

It wasn't done with the cutter above - it was done with a circle cutter - if you look really carefully you will see that the black is a thin layer OVER the white fondant cover - NOT the white petal shapes put on

You would cut a circle in black and cut off the petal shapes - leaving the centre - and then place on cake.

NOT a simple job - a tedious time consuming job with a GOOD eye for detail - they all need to be aligned properly and consideration taken to ensure no distortion when trying to place!

I've seen this cake before too, I'm a Rouvelee fan, the quality of her work in both design and execution blows me away everytime.  Wish I was that good