Before I really knew what I wanted, I bought a red 2.25" trackball and the Optipac to drive it. (I am leading up to a first-time build although I bought many non-working cabs, repaired and resold them late eighties.)
Now, after looking at all the wonderful panels that have implemented lighting, I want to go to a 3" (for the mass) and illuminated ball.
I have found blue (my favorite when lit) and clear-which seems like you could easily change the color using leds, maybe even alternate colors on the fly.
The question is, what do you think about clear. Having never seen one, I wondered if they might get hazy or otherwise show wear if used very much.
I have seen old white ones that look brand new when cleaned.