a three-color two-pattern double-knit hat
This has long been considered my signature piece, a three-color double-knit hat with two radically different patterns on each side. Despite the complexity, it's not actually difficult, and has been tested by people who have never done double-knitting before with surprisingly good results.
However, I don't recommend this pattern for beginners as a rule -- it definitely requires significant concentration and chart-following discipline.
This pattern is available as a standalone digital pattern as well as being in the book (or eBook) "Extreme Double-Knitting"
Where can I get it?
as a standalone pattern
as part of "extreme double-knitting"