Cosmic Boy, until Gary Frank, I think, has always had the suckiest designs, one of the worst being this one, but I'd say coloring his costume pink was always one of its worst aspects. Blue just looks better on him, and is more suggestive of magnetism as it's related to electricity, whereas pink not only didn't look very good, it didn't make much sense. I'm guessing it had to do with not making his look too much like Lightning Lad's. But then there's also that stupid space helmet he had for no apparent reason.