jit.scalebias for direct color changing of images or video. besides that there are dozens more effects you can play with.
For audio it really depends, snapshot~ can give you amplitudes to play with, or some fft~ to utilize frequency analysis for the visuals.
Try making some controllable, yet automatic ramps to change simple numerical values, use [scale] as needed, and apply them to your RGB levels. Also you can go HSL and send those values through [swatch], sometimes this is more intuitive to deal with color choice.