Stores like Who.A.U actually sell patches in their stores so you can D.I.Y. or have them D.I.F.Y. (Do It For You).
When done wrong you could look like a refrigerator magnet, but when done right these childlike pins have a whimsy quality that pops right out at you. The key is to keep it playful.
Floral cardigans over distressed shorts
If it's plain, it's not the same. These robust florals prints on flowy cardigans work so well over bleached out or distressed denim short shorts and offer a lot of styling options.