I think white walls are good if you're really not sure what you want or you are changing your furnishings regularly. Otherwise , go bold - my lounge room is black and gold - lights and all, and I love it.

if you have a theme color helps and even if you don't plain white walls are boring to look at day after day a little splash of color helps.

Depending on the room, the client, the aspect - so many things!

But generally a light shade (not necessarily white) is a good starting point for the walls.

Leaving white for the skirting, architraves, doors and trims.

It's less hassle to change decor than it is to repaint a room. I've lived in my house 6 years and painted my bedroom 4 times already. It's exhausting! The white has stuck it out the longest. So many whites to choose from as well. Grey and beige also work well and give contrast to the trims.

White is simple and timeless, the feature can be artwork, timber joinery, natural stone floor or the space itself with expressed architectural features for example exposed structure or highlight glazing, interesting ceiling spaces or a fireplace. I think you need to be careful with feature walls as good design needs to be logical and based on reason, this leads to contemporary yet timeless spaces for people to live in.

I paint all my walls white and add colour through artwork, cushions etc White is easy to repaint, looks fresh and your can change your colour scheme easily.