Add some pattern to the trays as a background.
Add a focal piece in the front center. The lower shelf has the most room for this on my tiered tray.
Add some alternating chunky elements such as cups to draw the eye back and forth.
Add some filler items in strategic places such as succulents and small framed printables.
Add some greenery or flowers into small blank areas.
And last, but not least, the beads!