RGB LEDs changing color to LFO?

[GhostofJohnToad]

So how would I get an RGB LED to change color with an LFO?  For instance with a quadrovibe I built, the rate led pulses in time.  So that principle but each pulse would be a different color.   And would this add any noise to the circuit?

[GermanCdn]

You can get multicolor LEDS with just two leads for what you're looking to do, they look really cool, I've tried it in trem circuits, and yes, it does add some noise to the circuit everytime the LED changes colour.  They would change colour with every pulse, but they change colour every couple of seconds.  I didn't try filtering the power for the LED though, that might have helped.