The very same advice can help with your choice of form and colors. Form plays with your use of color. Red tomatoes served on a round green dish with relief work that looks like a leaf are visually exciting because red and green are complimentary colors. If you add mozzarella cheese, the white pops out like a ray of sun. Ms. Stoddard also explains the use of light color vs. dark color.
White colors enlarge objects and dark colors do the opposite.
I recently painted a bathroom, with white walls, a taupe color. The new color really brought in the walls despite the fact that the color wasn't very dark. Try this technique with your booth or craft. Try this tip for your display shelf. In a small space, use the same hue in a variety of different shades so that the objects do not stand out and take up too much visual space.