When it comes to ornaments, anything goes.
Ornaments can be more than a ball with a hook.
Cards, ribbons, bells and dolls are all acceptable decorations for the tree. To give your tree more dimension, don't just place ornaments at the end of the branch. Secure your ornaments on the tree by pinching the hanger closed after you've placed the ornament. If you have an artificial tree, bend branches upward. Again, anything goes.