To preserve your artistic flower arrangement be sure to keep your vase three fourth full of water. Do not put cold water when you replace the water, always use warm water. And when your water vase begins to become cloudy or you can smell a foul odor, you have an option to replace the water or put a little bleach. Make sure to clean your flower vase evenly between uses, you can also soak it in water with a little bleach to disinfect it. You can always do this before you use your flower vase.
You could create an arrangement for any size vase, the larger the vase, the more flowers and greens to use. For Christmas time, use red, white and maybe even green flowers (like green button mums). Also choose from a variety of greens and evergreens out there. Accent a red rose in a bud vase with some baby's breath and cedar. Deep red alstroemeria are especially beautiful. There are many other flowers that would be perfect to use for Christmas arrangements, the link below will take you to a complete list of flowers, foliage, and evergreens for Christmas floral design.