I'm pinning this for inspiration even though there isn't a pattern given for this. Link takes you to ravelry lorijo's fair isle cardigan. She used unknown sweater pattern, fair isle pattern from some mitts, and colors inspired by a painting.
Ooooh, I love this! Just getting into a bit of knitted colour-work. This looks like it could be a very satisfying little project. PATTERN for Pompom Winter Ski Fair Isle Patterned Alpine Beanie Cap Hat // Adirondack Toboggan PATTERN