I got the pattern from Colie's Crochet. I loved how simple it was, and that she has patterns for pretty much any head size you could need a head for. I mostly made the medium and large adult sizes. I found that I had to take about an inch off the length of the large hat size, but otherwise the hats fit perfectly. I used Red Heart With Love yarn for most of the hats. The soft green pictured above isn't red heart, but it was a worsted weight I found at Joann's.
I made all the hats with three colors, but didn't finish them all the same. Some had two colors at the bottom, like this green one. Others had the single line, like in the pattern. Others had several rows of single crochet in alternating colors. I'll try to get more pictures up soon.