The trick is to paint your walls a color that blends in with your décor, and is neutral enough that the buyers can picture moving their furniture right in and having it feel like home.
One color I love is Benjamin Moore's Wish. It is a soft gray that will go with almost anything. Another good one is Benjamin Moore's Cotswold. A little darker than Wish and a scootch more beige, but also soft and neutral.
Of course these are not the only good staging colors. You need to choose what works best in your space ... but these are just beautiful.
Benjamin Moore - Wish (AF-680)
Benjamin Moore - Cotswold (AF-150)