Gradient circular changing colors of light with random spurts of faded white behind cloud and moving with it.

I witnessed a strange thing tonight from my backyard in northwest Reno. it was behind a slowly moving cloud. it was round, translucent and changing colors from blue to red to green and it would also be moving with the cloud. pretty high up so it was too high up and too late on a weeknight for it to have been some kind of drone color light show plus it was behind the cloud and faint. it would randomly shoot out faded white sorta roundish shapes that would roll through the sky like there was a dome or something it reminded me how a kaladiscope works as the cloud slowly dissipated so did the colors. then I went inside. very strange