There are different flowers dedicated to different occasions and emotions. Like that, for each month there is a birth flower dedicated. So if your friend or relative has his/her birthday in December, you can gift that special flower as the birthday gift. Holly, Narcissus, and Poinsettia are used in the month of December. The main reason for this is that these flowers are (especially Holly and Poinsettia) associated with the celebration of Christmas and winter season.
A bouquet of bright December flowers:
The one on this list is a bunch of bright colored flowers that are tied to make a bunch. The bunch has gerberas, holly, roses, carnations, and other seasonal flowers as filers. The holly flowers are produced by deciduous trees and shrubs. You can see these kinds of flowers in different species and mainly they are available in winter season. The gift in the link is an example that has holly flowers in it. You may buy them from the local florists and shops to gift it to your loved one.
A bouquet that has Christmas wish:
This is a cane basket that has pine cones, holly flowers, carnations, and Poinsettia in it. Since red and green is the color of December all the flowers are red in color and even the bow used is the same color mix (red and green). I had difficulty in finding the right bouquet with daffodils or Narcissus in it. However, you can get them from the local florists.
If you get daffodils, that will be the best choice as a gift for your friend who has the birthday in December. Do not forget to get a greeting card and cake for the celebration. You can even buy a gift combo that has wine bottle with it.