A terrific website with printouts and instructions on making an anatomically correct brain hat can be found here. A great resource for teaching kids.
PS: The website belongs to Ellen Johnston McHenry, who is a home-school curriculum author. Among others she published The Brain: An introduction to neurology for ages 8-14 - a very nice, comprehensive book that starts from zero and ends somewhere at the early undergraduate level while explaining everything gently. Worth having a look (here)!