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.
Flower decorations are used as accessories too like boutonnieres that are worn by grooms, attendants, ushers and bride and groom's fathers. They are made from single or several small buds and are worn on the left lapel of the jacket. Corsages can be worn in a variety of styles like pin_on, wrist or handheld and are made of either a single bloom or a small cluster of blooms.