The hardest part of making these socks for the Biscuit was trying to snap a photo of her modeling them. They're made out of some of my self-dyed yarn, and the stitch I used for the leg and upper foot was a simple four-row repeat that resisted pooling and resulted in "sparks" of color in each row. I haven't seen it anywhere, but as with most knitting patterns I'm sure several people have thought of it.
Spark Slip Stitch, over a multiple of four stitches Worked in the round Row 1: *K1, slip 1, K3* Row 2: Knit Row 3: *K3, slip 1* Row 4: Knit
To work back and forth: Row 1: *K1, slip 1, K3* Row 2: Purl Row 3: *K3, slip 1* Row 4: Purl