“One Zentangle A Day” by Beckah Krahula - Day 14 - Decorative Value The tangles introduced in this chapter are Changing, Dyon and Keeko. Decorative value involves contrasting shapes and planes of color rather than having an established light source to produce interest and move the eye through the piece. Tangling on a black tile is usually a good example of decorative value because you’re already starting with the basic shadow of a dark background.