Choosing a Color
First things first: When selecting a wall color, taking the color of your floors into account is crucial. People often forget that their floors have a color, and they think only about how a paint hue relates to their furniture. In my apartment, the bleached wood floors really drove the bus and led me to go for beige walls and ceilings to create a cohesive look. But which beige? Neutrals are not a free pass. They can be as nuanced as bright colors, so you have to experiment with warmer and cooler versions of the shade you think you want.
Remember that samples are cheap but repainting a room is not. I chose a range of beiges, from a pale taupe to a grayish brown, and painted large test swatches on the walls. You can also paint pieces of poster board, which are easy to move around a room, to see how colors look in different light. That's an important point: The same color may appear dramatically different even on adjacent walls.
Spend a week living with your samples, and ask the following questions: When will you be in that room most often? At what time of day does each color look its best? Consider what's outside the window as well (deciduous trees? an expanse of lawn?). I noticed that a brick building across the street cast a red glow on my walls, so I knew I needed a yellower beige for balance.