This hat was designed for a friend who loves neurobiology and would be perfect for any biology buff.

I designed a white neuron on a green background complete with a cell body, axons, dendrites and a synapse.

Included with the pattern are both a chart for the pictured hat (with some extremely long carries which can be tricky) and an easier chart that only has 4 rows of long carries.

More information on the hat can be found at http://www.craftimism.com/2014/03/neuron-hat.html.