Violet is a very spiritual colour, often used in spas for example. It’s calm, and ideal for bathrooms and bedrooms. If painting a wall or using a wallpaper seems to bold, just add some fresh lavender flowers :)
Light reds and yellows are very energetic and vibrant. Better used in small amounts to light up any room.
Dark reds, gold and blacks add an atmosphere of luxury. For the extra luxurious feel add some fabric textures.