This is all very subjective, but I don't think view or color should be out of the equation.
As babies, we are already attracted to "non-natural" colors and visual effects, like primary colors, bright surfaces, etc.. So your species can be attracted to whatever colors they have access to, as long as they are not hurt by it. Even if it hurts a little, in fact. fantasies about the bright outside world can be part of it.
However, I think it would be more interesting to focus on hearing. If they have bat like ears, they will be able to feel surfaces just using echo. You can imagine highly complex caves with a variety of surfaces to create some kind of auditory hallucinations, even going as far as to play an entire minute of delicate symphony from one droplet of water, or snap of the tongue. Depending of craftig skills, you could eventualy get to the point of telling ancient stories (epic battles or discoveries, or creations) just by sitting in the right place of a specialy curved cathedral of rocks and sand and anything that will create distortion and magnifying from the origin sound.
This scultures could be either entirely dark for immersion, or painted for additional info, but then painting would affect sound propagation.
Still, I think this is an art that a cave dwelling species with spacial earing would enjoy more than we can.
For aestethics, I think will go back to visuals, as constant sound would impair their spacial senses and would be considered a nuisance pretty quickly. If it is a socially structured species, with "classic" seduction and reproduction, bright and colorfull, so you can be seen even in dimly lit environment, and seductive structures that show how big ears are, how eyes are good, and how symetric and healthy they are.
Apart from that, maybe clothes that absorb sounds would be "dark and misterious", or you can imagine clothes that also simulate health, by 'echoing like' (not looking like) good fur or good muscle.