In Paint Shop Pro (I used version X) create a circle with your selection tool the size you want your bowling ball to be. Go to the Balls & Bubbles filter and use the settings in the screenshots.
Once you have your ball, create a smaller circle with your selection tool for the finger inserts on a new layer and fill with black. Then give that filled circle a drop shadow with white. (refer to the screenshot for settings)
Duplicate the black circle twice and move into the proper placements on the ball. The thumb should be a bit larger to be authentic looking, I didn’t do that here.
Did I lie? That’s it, super easy!