I have the Smoked EVO-R fog light on my Black Z so it blends in until the light is on.
No ugly red butthole. It is Plenty bright at night when it's blinking. I have it wired to come on with my headlights and blink on braking. Love it.
As for blending with OEMs, I think the LEDs match the LED taillights better than an OEM bulb, but that's just me.