That is a very nice scarf pattern. One just about anybody would love to wear. Maybe you could design a hat yourself based on the stitches in the scarf, with a little thought. When you get to the part of the hat where you do the decreases, just make it all stockinette or garter or something and that would make it a lot easier.
Oh my gosh! I have never tried to knit something like that. It is beautiful! I have never tried any cables or anything but I want to and I plan on it. What is the pattern for that? I will probably have to start knitting something that doesnt have so many cables in in, but eventually I might be able to knit it. Best wishes in future knitting!