How can you change cursor colour?

Can’t see it in User Prefs. Thanx in advance.

I don’t believe you can

If you want to make it invisible, you can’t. (I only say this because it’s a recent fad on the boards here) If you are trying to make it more visible, or stand out against the window background, you can try changing ‘view overlay’ color in the 3D view theme. This will change the color of the crosshair part of the cursor. Be warned that it may change other parts of your view as well though not anything very commonly used AFAIK.