When painting an interior different colors, linking rooms with color may not seem very important if your rooms can be separated by doors and walls. If you can see from one room into another, however, the color relationships between those rooms will affect the outcome of your paint job.
Using unrelated colors in adjacent rooms can make the house feel overwhelming, while colors that flow nicely together will bring a home more uniformity and appeal.
The basic components of an exterior paint color scheme are body color, trim color, and accent color. If you live in a Victorian house with multiple architectural details, you may consider more colors to bring detail out. A standard home however should be limited to 3 colors because more is not always better.