These brain cupcakes are by the very very talented Pamela on Flickr (xsomnis) and they are made of:
Red velvet raspberry cake with
French vanillla cream cheese frosting and a chocolate brain
I love that: "a chocolate brain" - I wish I had one of those sometimes!
Made famous and known to us by Street Anatomy and Boing Boing
Here's another tasty brain version via Pamela - see her Flickr account for more: