Building tips/ideas

Hello, currently using the Arena structure from Moogs soaring structures as my primary base, which is located above a cherry wood forest with a village in it I plan on remodeling for minecolonies, thought that would be pretty cool.

My question is for the Arena - what do you guys think would be a cool color palette for the interior itself? I’m looking for a sort of whimsical, cyberpunk kind of theme for it. Have a couple create moving parts in it, I.e door, automated entrance towards the inner portion of the mountain/structure, etc

Thanks in advance, definitely am not the most creative/artistic person. Hopefully some of you are.