Crystal ball, Koosh ball, WIFFLE Ball, rubber band ball, kick ball, squash bal, bowling ball, bath balls, exercise ball, relaxation balls,
Tennis balls, cricket balls, ba<x>seballs, bucky balls (http://goldennumber.net/buckyball.htm).
Awesome! Mine have been mentioned already. Thought about it, can't come up with one of my own.
A dance, a sphere, courage, a joint - mechanical and skeletal, fire balls, cotton balls, disco balls, eye balls, balls of wool,
luciille ball, great balls of fire, balls of gum, bath balls, canon balls, the people who stand up for themselves have balls but i dont know what they are called.