Of the four, I like #3 best -- You could consider something like this:
http://www.connectingthreads.com/collections/Wrap_It_Up!_Quilting_Fabrics__L115.html The green octagon: It would give the appearance of having circular "stamens" in the middle of your poinsettia flower. The red would work also -- and they are on sale :) I think something that is entirely different than your beautiful holiday fabrics in a green or red would be lovely. You could even get away with a dainty holiday stiped fabric in reds or greens or a combination thereof.