I have some tree decorating dilemmas and would appreciate an advice.

Some of my ornaments are matched, and some are unique. To explain, the matched ones are mostly colored balls (of diferent sizes), and the unique ones are really all diferent in shapes, colors and sizes.

What can I do to unify the look and to avoid having a messy looking tree? I don't mind having many colors (I actually plan on that), but I wouldn't like to go over the top and have people experience sensory overload when they see it.