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.
Wreaths are rings of flowers that are also used as centerpieces, headpieces or door hangers. You can ask your floral decorator to give you a sketch or sample arrangements that would help you get a better idea as to how your wedding decoration would turn out to be, based on which you can tell the alterations required by you. Flower decoration is the most important and indispensable element of every wedding decoration. Orange blossoms, lavender, orchids and tulips are also attractive options to be used for flower decoration at the wedding.