Yarn: I used some unbranded alpaca/merino blend purchased at the Maine Fiber Frolic-- it's very dense and fuzzy.
Pattern: Selbu Modern by Kate Gagnon Osborn. I seem to have a slight crush on the ladies of Kelbourne Woolens-- so far I have knit four hats from either their patterns, their yarns, or both.*
Modifications: I couldn't match the pattern gauge with my chosen yarn, so I subtracted two pattern repeats horizontally and 1/2 a repeat vertically. I think it turned out a wee bit small, even for my tiny head-- so I may need to give it to someone with an even tinier head.
Etc: I think we spent more time talking about taking pictures of these hats than we spent actually knitting them... but it's pretty sweet to have almost matching hats!