Technically, we can't see UV... but if we could, it would look something like extremely rich purple. The good news about big holes in the ozone layer is that we will have plenty of opportunity to train (more likely evolve) our eyes to see weird photons. Seeing as the oceans will rise a good amount, I figure that Colorado could have some nice beachfront property. I hear that they have a massive dump of old tires in Colorado, a "tire graveyard" as they morbidly call it. Tires are very slow to decompose and are not prone to erosion like soil or sand. What a great place to relax in the late Anthropocene!
A romantic encounter in the late Anthropocene, after much of the ozone layer has been destroyed and land is flooded. Increased electromagnetism in the atmosphere will support beautiful Aurora Borealis.