The ornamental design for a paintball, as shown and described.
FIG. 1 is a perspective view of my new design for a paint ball.
FIG. 2 is an elevational view of the front half of my new design for a paint ball. An elevational view of the back half would be a mirror image thereof; and,
FIG. 3 is an enlarged view of that portion of the paint ball shown in 3—3 of FIG. 2.
The broken line showing of a paint ball gun barrel in FIG. 1 is an environmental element and forms no part of the claimed design.