Glass Christmas Ball Ornaments
For the tried and true, you can always go to Walmart or Target and stock up on machine-made ball ornaments. But, doing so is really and emphasis more on "been done and tried" rather than "true". Seriously, decorating for Christmas with just a little flair and personality can make the difference between a uptone environment enjoyed by all, and a chore that gets checked off the task list, something nobody is going to really enjoy.
When looking for Christmas decorations with a little personality, you can still find Christmas ball ornaments that add not only to the overall appearance -- as is the goal with multiple ball Christmas ornaments -- but also contribute on an individual basis. You get the overall look by standing 10 feet from the tree, but then your guests can be drawn into the tree by uniqueness of each ball ornament. Think "overall" as well as "individually unique". Designing your Christmas decorations with both perspectives will produce a lasting impression approaching art and leaving department-store drab behind.
One of the best ways to achieve overall continuity yet individually unique ball ornaments for your Christmas tree is to purchase the same ornament, but personalize each one for a family member. Buying personalized glass ornaments is a great Christmas gift idea, as everyone loves to have his or her own ornament that they can consider their ornament uniquely theirs, while knowing that it's also creating your overall Christmas decor theme. Again, my recommendation is to think broad-scale and overall look, and then turn your attention to individually unique Christmas ornaments within the theme.