Pizza Hut planned to put their logo onto the moon using lasers. The idea was abandoned when it was discovered that the logo would need to be the size of Texas.
Moonbows, or lunar rainbows, are rainbows caused by light reflecting off the moon. They often appear white, as the light is usually too faint for human eyes.
The extreme UV environment on the moon means the flag left there have turned white. The original flag is thought to have been knocked over & reduced to ashes.
The moon is actually very dark, with the reflective strength of coal. It reflects light due to the opposition effect and loses it’s shadow when directly in line of sight of a light source. (e.g. the sun)