This is really more of a guideline to make a hat like the one pictured. Feel free to adjust as needed to get it just like you want. You can use this tutorial to make a similar hat out of other weights of yarn and other sizes. Remember, this is untested, written from notes from a few years ago.

Check out the inspirations behind this hat - the Nuance Hat by Hailey Redden, and the Puff Stitch Crochet Beret by creativeyarn, both with lots of fabulous designs.

And yes, the title is a reference to Happy Little Trees - a reminder to find delight in the simple things in life, even puff stitches. :-)