I'm sure there are so many uses for tennis balls and please add to the comments section any more helpful ideas you have.
Click here to check out the Tennis ball mate previously posted.
HAND TOWEL HOLDER-
Here we have made another tennis ball mate and stuck him to our bathroom sink cupboard for the kids to use as a "hand towel holder", they love it.
KEEPING KIDS SAFE IN THE BATH-
To prevent children from burning and hurting themselves in the bath, place a tennis ball (with a slit in it) over each tap. This will prevent any hot water accidentally being turned on and harming your kids. Easy and effective. Just slip on once you have finished filling up the tub.