You could look at using silks. If there is a flower you love. A lot of time florists can get flowers that are out of season, but it'll cost a lot.
I also found this: from:
Flowers Blooming in Winter are:
http://www.theflowerexpert.com/content/growingflowers/flowers-and-seasons
Acashia, Alstromeria, Amaryllis, Carnation, Chrysanthemums, Cyclamen, Evergreens, Gerbera Daisy, Ginger, Helleborus, Holly berry, Lily, Asiatic Lily, Casa Blanca Lily, Narcissus, Orchid, Pansy, Pepperberry, Phlox, Protea, Queen Ann's Lace, Roses, Star of Bethlehem, Statice.