I notice most current entries don't adhere to the rules of no labels and no background. Though I have no problem with the "no labels" rule, I wonder if the "no background" should be modified for this particular topic to allow a colored background or perhaps a simple gradient. Baseballs are close to white, so they might not be best displayed against the white background that results when the background is transparent. (Though, as the Wikipedia baseball picture illustrates, with the right shading, a baseball against a white background can still be effective.)
(Also, a gentle reminder to dipstick: As attractive as the Blender-rendered baseball may be, Blender is not 100% PDN.)