I'm not sure if this is in the right spot. Basically I want to light up my project. I'm curious about the wiring of the led lights. I've done it before but my question is what do I need to add to the circuit so that when they are turned on they shimmer. I'll have a about 8 LEDs with 4 being one color and 4 being the other. These are the small 3 or 4mm LEDs. Basically I want them in the base and to give the effect of moving fire.