I just finished this Better Than Booties sock from Knitting Daily. I see myself making up a lot of variations of this pattern since I have a lot of Cascade 220 left over from another project.
Pattern: Better Than Booties Sock Pattern
Yarn: Cascade 220
Needles: Size 2 dpn
Modifications: The pattern calls for using Lorna's Laces, however I thought the Cascade 220 would be a lot warmer. I decreased the cast on stitches to 30 and just separated the chevron's by 6 stitches. I also left off the chevrons on the top of the foot. These fit about a 3-4 year old. They're a bit snug on my 3 1/2 year old, but she's tall for her age.