The first colorway that popped into my head was Spirited Away #2. What's really great about the Hitchhiker pattern is that the garter stitch helps break up all the colors, and variegated colorways look great in it. This would be a bit of a bright/bold choice, but it would be such a fun piece.
Changing Foliage would be a very fall-ish choice.
The jewel tones in Jewel Box would make a very luxurious-looking Hitchhiker.
Which colorway would you choose? Or would you pick a completely different colorway from the Gynx Yarns collection?