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.
My arrangements cross_pollinate the oriental essence that I learned through the art of Ikebana with the practicality that modern technology offers us in the form of lifelike silk flowers. So while I take strong inspiration in the principles of harmony, methods and the spirit of Ikebana for all my designs, it is the ample diversity of silk flowers that allows me to unleash my creativity in ways that I never thought were possible. Sort of a bridge between east and west, or the best of both worlds, if you will.