Yeah I say keep the hands black because the light from the other fans kinda bounces off the hands and adds cool shadows to them. I found these on amazon and you could just make a mount for the ball that attaches to the back so you couldn’t see it. https://www.amazon.com/dp/B00GOJDB84/ref=cm_sw_r_cp_api_i_2JoKEbPX22H45

Or you could use a clear ball and put a whole in both hands with a light in each and have them kinda shine thru it