Colors drive our vision, they can impact our mental states, and are one of the fastest ways to add emotion and impact to any visual work that we create. Focusing on colors in writing draw attention to it and with some clever emotional investment on the words of the author, it creates a lasting impression, a theme, and possibly foreshadowing. With visual arts, it’s even easier; a specific color draws your eye, makes you focus on something that might not even be what the viewer is supposed to be focusing on, allowing for all kinds of pseudo illusionary effects.
Use some color in your work! Be specific in your words, use colors to your best advantage! Use something vibrant in a muted pallet, draw attention to something important (or away from something important), and really engage the visual centers of your audiences minds!