Not a big rainbow but just look at the color and pattern on this

Over Gravity's Rainbow

Take a Radiating, Immersive Trip Into 'Ay-O's Happy Rainbow Hell

What Is a Rainbow?

Adding intersex representation to the Pride flag

Bucks Rainbow Allies

Why Do You See Colorful 'Rainbow' Patches On A Wet Road? » Science ABC

A New Theory in Physics Claims to Solve the Mystery of

How rainbow colour maps can distort data and be misleading

Rainbow - Wikipedia