Contrast - contrast draws your eyes to a page, it grabs your visual interest. The trick is to be strong. Don't be a wimp. Repetition - repeat certain elements throughout the piece. You might repeat colors, textures, typefaces, rules, dingbats, bullets, or graphic style.
Repetition serves to unify a design.
Alignment - make sure everything on your page is aligned with some other item on the page. Either line up the baselines, the right edges, the left edges, the tops, or the bottoms. If items are not aligned, then make sure they are really not aligned - don't almost align things. Proximity - refers to the spatial relationships between elements. The designer must keep appropriate items together.