Embellish your kid's Crocs
I can't say I'm a fan of Crocs -- those brightly-colored plastic clogs that seem to have taken over the footwear universe. Obviously I'm in the minority, however, because I see them year-round here in sloshy Portland. They are undeniably practical for kids. Lightweight, easy to clean, slip-offable.
If your kid is still wearing Crocs despite the chill (or, if, God forbid, you are), perhaps some wintertime embellishment is in order. Kirsten pointed me to directions for creating your own Croc Charms.