Last Christmas, I accidentally broke off some stems from my poinsettia. Not wanting to "waste" them, I put them in small vases around the house. They not only added some color to those rooms, but the poinsettias actually rooted! The red leaves eventually fell off, but we had little green plants that continued to grow all winter. So, this year I am purposely cutting all the stems off my big poinsettia plant and doing the same thing!
And a little something I just learned--while you wouldn't want to encourage it, poinsettias are actually NOT poisonous to people, dogs, or cats if eaten.