Is there an existing, unchangeable or desired color in a room or on the outside of your home that can be used as a starting place?
Find a pattern or combination of colors in a piece of fabric, on a pillow or in the case of an exterior, a single stone or brick that contains that color.
This pattern or combination of colors should appeal to you; search until you find something that really draws your interest.
Use the other colors in the pattern for the rest of your color choices. Perhaps there is a neutral hidden in the pattern that can become the wall color, an accent color may exist in the group and that can be used in small amounts, maybe on a feature wall or on a front door.
When starting from the ground up you can also accomplished this with a pattern or in some cases a favorite painting or even a pleasant place to visit.
Using a painting as inspiration, in this case the pale off white could be the walls, the deep blue a carpet or piece of furniture, the lemon could be curtains.
You don’t have to take the colors as they appear you can neutralize them by making them lighter or grayer and you can make them lighter to tone them down.
The colors should be used in three proportions of visual interest, the largest for walls, the medium for carpet and the smallest for accents.