Color Kid could change the color of things. It never seemed to great a power, but he did save Superboy and Supergirl back in the old days by turning a bunch of green kryptonite into.... whatever color didn't harm real Kryptonians, I can't remember. Maybe blue.
Many years down the road CK's power got a little more useful as he learned to make crazy light shows to disorient people. I think he might've been changing the color of the air or something.
How the hell did that work, anyway? Well, it looked cool back when fancy-shmancy computer coloring was the coming thing.
And I think Polar Boy got rejected for one of the standard reasons like "power too uncontrolled" or the like.
