One local 12U tournament I umpire for each summer (usually like 6-8 teams) does a deal where, after each game, each team gives one of the two game balls to the player on the other team who they felt was their MVP. At that age level, the ladies still appreciate the sentiment, and it's nice to see the coaches talk with the girls about who they felt on the other team did the best, regardless of the score/situation/pool play or bracket, etc. Shows good sportsmanship during the tournament vs. after, etc.