For table top displays, follow these guidelines
Compose your display so that one item dominates. Make sure items are appropriate in size and scale for the surface. Avoid items that are too big or heavy, or so small they get lost.
Odd numbers work better than even numbers 3 or 5 objects will work better than 2 or 4.
Unify a collection of small objects by placing them on a tray.
Place objects close enough together so that they are visually related. (For example, Don't spread 3 objects out on a cocktail table, group them together)