Once upon a time I had an awesome Santa hat. God only knows where it is now, but it's hard to find any that aren't made of cheap felt any more. (Though I did see a rhinestoned one today, I WANT ONE OF THOSE) I have been craving a crazy Xmas hat, and I like trees, so.... here you go.
The pattern I used was over here. I added my own garland and sewed on all of the random beads I have around the house that match nothing. It was a big hit!