I have just obtained some high intensity LED's. I want to use two pairs of them and flash them alternately. I want one pair to flash 3 times in about 1/2 second, and then the other pair flash 3 times in about 1/2 second, and alternate back and forth like that for about 5 cycles. The actual timing is not critical as this is for visual effects. I have a couple ideas myself on how to do this, however I need a circuit that uses as few components as possible. I'm afraid my ideas might have too many components. I want to drive the LED's with about 500mA, as they are high intensity and can take that current. My goal is to use as few components, and consequently as little space as possible. Any suggestions would be appreciated. Thank you.