Cthulhu is a fictional cosmic entity created by writer H. P. Lovecraft and first introduced in the short story "The Call of Cthulhu".  Well, that's what wikipaedia says!  But Cthulhu is so much more and we were asked to make a hat several times before I managed to create one I was truly happy with.  One lady who bought it told us she wears it while out walking her dog.  She says its perfect for this activity, although I neglected to  ask what exactly it was that made it so perfect for early morning dog walking!