Decorate with moldings. For greater impact add moldings to your tray ceiling in an interesting pattern (you might need to hire an experienced contractor for this). Moldings are available in many shapes and patterns, and you can use a great assortment of pre-primed panel moldings and corners to create boxes, rectangles and patterns; there are even arched pieces available that can be used to create rings. To further dramatize your tray, install cove lighting (indirect lighting built into ledges, recesses, and ceilings). Lighting professionals recommend installing cove lighting at least 18 inches from the ceiling and 6 feet 8 inches from the floor.