Thanks all for your sage advice. I have never designed my own hat before, being that I've only been knitting for 2 years, but maybe it's something I can work on. I just wouldn't know if what I came up with was unique enough! Or maybe I'd make something, thinking it was all mine, and then turns out it was an idea someone ELSE had and I had no idea!
This is a tricky situation. I think I will tell my friend I need to hold off until I can come up with something on my own.
I'm JamOKnit on Ravelry.