[Jammet]

:3 I've had this idea recently and to increase the odds that it'll survive, I'll throw it out here.

If you're already writing some sort of addon that influences how a character looks, what they wear, consider throwing in way to automatically switching things to different profiles, depending on time of day or night. If you wanted to go all-out, consider moon phases, too, on the calendar?

Not only for looks, but imagine the roleplay-aspects.

Imagine giving your character glowing deadra eyes, but only during night time. Your Khajiit would enjoy more glowy cat eyes at night.

Looking more like a vampire or werewolf at night, or during full-moon?

Imagine being forced to morph to werewolf at midnight, full-moon (voluntarily, or reminded to, in preferences maybe?).