You probably know what colors you like, or are likely to buy, as well as which colors you wouldn't use because you hate them.

You put on a nice color that looks good with the floors and counters, that has a good chance of looking good with furniture in the colors you tend to like.

A light creamy yellow, a pale grey-green, a pale taupe-grey ... if you decide later you don't like it, it's a good primer.

Here is a link that might be useful: Picking Perfect Paint

I suggest also go for pastel shades if you are not sure what do you want. It is always easier to add some vibrant upholstery or a fancy piece of furniture later than to try to balance vibrant and dark wall colours. Nevertheless even dark wall paint is easier to balance with furniture, upholstery and accesories than a varicoloured wallpaper.

But finally it depends on a person's taste, what do you like.

Here is a link that might be useful: How to choose wall paint

I looked at colors on paint chips and then wrote down choices of what I liked, without considering what furniture and accessories I have. Then I went over to the new house and put the paint chips on the wall and just picked what I liked. Once the paint was up, I was surprised at how much blue and beige I picked, without really even thinking about it. While each room is a different color, it all melds together really nicely, thank goodness, and I am very pleased with my color choices. I will worry about furniture later, once we move, but I think it will all be okay.
If you like blue, BM Van Courtland Blue is the prettiest color! My builder has really fallen in love with it!! And a really nice blue/gray, is BM Nimbus Gray, which reads more blue than gray, but it's lovely!