Over here is a website where you can buy over 300 different brain-themed T-shirt. Yes! I have to admit, some of them have more to do with zombies than neuropsychology, but no matter.
Mind you, when having a talk about neuropsychology at my 3-rd grader's class, I told them that we are interested in the brain and showed them this image.
PS: and here is another website with brain T-shirts and gifts. Very nice artwork. And there are a few here as well.