need simulator

I built three 7-foot diameter light displays using 7W incandescent bulbs, but I find them too unwieldly for making program changes in my PIC. I thought I would build a small 10" diameter display using LEDs and the same connectors and PCB (with my PIC on it) as I am for the large display. This is do-able, all I need is 96 LEDs in 4 different colors with maybe some transistors for boosting power.

HOWEVER, I once saw a circuit simulation where "software" LEDS could be lit based on the circuit drawn in the simulator. Is there a software simulator that I could just draw my 96 LEDs out, then feed it the code from my PIC?