Try this, for some blur. Render your image with the ball in three or four rotated views. In postwork use layers to Blend them together at different strengths then merge all the layers. Select Just the ball when done and add a BLUR filter to just the selected (the ball) area.
Looks good but I would keep the Seams all spinning in one direction at one angle. So it spins in just the up down axis not top to bottom. It would look better that way to me. Think Spinning like a top. And a bit less Blur.