Heres the way i do it...
I make a sphere add a lambert.
under incandescence i click the checkerd box and go to ramp.
then i go to the ramp and change the colors and to this..
and make sure u have the type U Ramp
PS. you can also mess around with the HSV color noise.
oh, and when u add more lights make sure u got to go to windows and relationship editors and go to light linking and make it so theres no lights hitting the sphere.
let me know if this helps
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