Dressed by the league, the loser stands in a store window or league-arranged retail display holding a pose for 30-minute intervals. Blinking is permitted; moving when children knock on the glass is not. A store owner's permission converts this from crime to comedy.
Budget note: this one costs nothing but dignity, which makes it a strong pick for leagues that would rather spend the pot on the champion than on the loser's downfall.
Seen in the wild: fantasypunishments.com