This is clipart converted and broken apart that has been released into the public domain because the document says so, and its from NASA, a USA government agency. The publication is called "The Brain in Space:"
http://www.nasa.gov/audience/foreducators/topnav/materials/listbytype/The.Brain.in.Space.html
I’m not capable of writing a blog theme, since I don’t know a thing about php. However, I can help with the visuals. Here is a variety set of vector web page design elements. Files are in AI, EPS, and SVG format. In order to customize, you will