The formal dining room is an interior in flux. For decades it was a mainstay of the American home, but in recent years it has often found itself co-opted for a playroom or home office. Today, the dining room is making a comeback, appreciated again for the way it provides a spacious, welcoming environment that brings family and friends together. But successful entertaining requires more than just a dedicated space. In particular, the colors you choose for your dining room go a long way toward setting the tone for your gatherings. Here, design experts share 8 of their favorite hues and tips for using them in your own dining room.