I've come up with this sock cuff treatment that turned out pretty well and have decided to name Fibonacci's rib. It's alternating intervals of stockinette stitch and offset 3x3 rib that follow the Fibonacci sequence. I worked these toe up, but just switch the order if you're going cuff down. It's the perfect soft touch of geekiness that the wearer may not even notice.
Round 1: 1 round of 3x3 rib, starting with purl 3
Round 2: 1 round stockinette stitch
Round 3-4: 2 rounds of 3x3 rib, starting with knit 3
Round 5-7: 3 rounds stockinette stitch
Round 8-12: 5 rounds of 3x3 rib, starting with purl 3
Round 13-20: 8 rounds of stockinette stitch
Round 21-33: 13 rounds of 3x3 rib, starting with knit 3