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Popping to handstand from the Ballast Ball is one of my favorite upper body (but really whole body) moves.  You can't duplicate this move on an un-weighted stability ball because the ball will get away from you in just a rep or two.  With the Ballast Ball, I will perform sets of 15 or even 25 pop-ups. 

Talk about a great way to build strength, body awareness, cardio vascular fitness, the whole thing.  Like I said, this is one of my favorite exercises with the Ballast Ball.

If you are very advanced, you might try popping up into handstand and lifting one arm in the air for a brief moment, before coming back down to the ball.  

Another thing I like to do is hold my handstand for 10-15 seconds before coming back down for another rep.  Great way to train for the handstand and get a great total body workout at the same time.