So much that goes into this… consider the colors outside that you can see through the windows, the natural colors of your local environment, any particular seasonal colors you find yourself gravitating towards (I love autumnal tones)! And don’t forget about paint finish and textural application techniques 😍
If you live in a particularly sunny/warm or gloomy/rainy environment and want to counteract or enhance those pick colors accordingly. I would also suggest looking into color psychology like if you’re depressed a lot of the time and would like to feel uplifted use bright sunny colors but if you often feel anxious and want to feel more sedated choose something less mentally stimulating.
Pick colors that would look good with the furniture and art you have or want to have… Curtains and rugs can be a beautiful way to add large swaths of color and texture too…. I love light filtered through a pink orange or golden curtain! And you cannot go wrong with deep rich jewel toned walls in different colors for every room if you want something impactful imo.
I’m sick in the head so I always love a good crisp white wall and adding color everywhere else. The walls in my rental house (I am NOT going to paint) are mostly varying shades of blue and gray which I thought I would hate but surprisingly I love them and find them soothing. I have a little sunroom with pale green walls that looks out into a lush verdant backyard with gorgeous trees and I love that combination!
GO CRAZY WITH FREE PAINT CHIPS tape them all up on the walls and see what clicks for you!!