Shuttlecock is the ball of badminton and there are rules as to what it can looks like. 

Elephant polo is similar to traditional polo except for one major difference, they are on a giant elephant! The equipment that is used is similar to polo such as the ball and a longer mallet. According to the World Elephant Polo Association Rule 1 of the organization section of the rule book: 1. The Game will be played by four players on each team. The game is played on a marked pitch of “100-120 metres x 60-80 metres”, using a standard size polo ball.

Were not the only ones who love playing sports. Flyball is a sport for dogs, and they have regulations for their balls that are used in the sport.

Bocce ball is played with not 1 but 8 balls and on all different types of surfaces such as grass, sand, and indoor turf. 

In 2000 DreamWorks made The Road to El Dorado. This story of two spanish swindlers who were looking for the gold of El Dorado, but came across so much more. How does this relate to sports balls?

Kickball is a game played by both youth and adults. Similar to baseball this game has four plates, one ball but no bat which makes the game more easily accessible for youth to have an introduction to other sports without specialized equipment or a certain skill set.

Ulama is a game that descended from the Aztec version of the Mesoamerican ballgame, the game is one of the oldest continuously played sports in the world, and is also notable for the fact that it is the oldest known game utilizing a rubber ball. (Wikipedia – http://en.wikipedia.org/wiki/Ulama_(game))

Quidditch was a fictional sport where wizards would fly on broom sticks in the wizarding world of Harry Potter. This fictional game is fictional no more. Potter fans all over the world have turned this game into a phenomenon with rules and regulations and even a world cup! 

Jai alai is believed to be of European decent specifically Basque. Jai alai is popular in Latin American countries and the Philippines because of its hispanic influence. The game is similar to handball and racquetball with the court having  3 walls. According to the tools of the trade: 

Dodgeball is a classic gym game that is played as early as grade school.