What a great question! Do make sure there are no restrictions on an exterior paint color. If there are, well, there's your answer. If no restrictions, look at the neighborhing houses and see if there is a certain "feel." If so, it will help to fit in. An investment property is not the place to make a personal design statement! You want the property to be clean and shiny and well-maintained and welcoming. And visit your favorite paint store or home improvement store and have some fun! In addition to all of the small paint samples, they will have free pamphlets that show combinations of main/trim/accent colors that work well together. Many stores even have themed pamphlets such as Spanish/Traditional/etc. Remember that you can buy paint in a sample size, and go home and paint swatches so that you can view the color in real life, and at different times of day. And remember: always keep leftover paint, clearly labeled, available for later touchup work! Enjoy the new house!