My mom and I always co-knit a pair of socks when the family goes on vacation. I do the "twiddly bits" (heels, toes, and bind-off) while she knits the boring stretches in between.
Details here (Rav link). The yarn is S. R. Kerzer On Your Toes 4-Ply with Aloe Vera in the "Weekend Print" colorway.
These were meant to fit my 7-year-old but I forgot how loosely my mother knits... this comfortably fit a woman with size 7 feet! However, my son loves the colors, so I've packed these away until his feet get a bit bigger.