Unfortunately the addition of colored vapor and blacklights will do nothing more than fuel the FDA's argument of trying to attract the kiddies in my opinion.
What would be a benefit to the world of vaping would be an odorless and vaporless e-juice that still had a good throat hit. That type of juice would come in handy when you're situations where you need a vape, but don't wish to draw the attention. Couple that juice with a non-lighted power source and it would be the perfect nic inhaler as I see it.