Effective paint-filled balloons can be made from water balloons and water-based nontoxic paint. Simply use a funnel and a squeeze bottle to load each water balloon with appropriately colored paint and then carefully tie the neck of the balloon to keep the paint in.
Paint-filled balloons have been popular for decades and have a number of different purposes. Some artists hang fabric sheets, canvases or large pieces of paper up against walls and throw the balloons at them to create a pattern. Balloons can also be hung on the backing material itself and popped with darts. Games in which paint-filled balloons are thrown at opponents are also particularly popular in the summer.