When it comes to describing something that is "rich in color," there are a variety of synonyms to choose from. One option is to use the word "vibrant," which conveys a sense of bright, intense hues. Another synonym is "saturated," which implies that the colors are deep and strong. "Lustrous" can also be used, especially when referring to metallic or shiny colors. "Opulent" is another good option, suggesting that the colors are rich and luxurious. Finally, "dazzling" is a great synonym to use when describing colors that are bold and eye-catching. No matter which synonym you choose, the key is to convey a sense of richness and depth.