Don't buy into the Christmas industrial complex, man. Tune in, drop out, and recycle your poinsettia year to year.
I hadn't expected much from this experiment - it really just stemmed from my desire not to throw the plant away after last Christmas. There are some really complicated instructions out there for reflowering your poinsettia, but I just treated it like any other houseplant. Kept it near the window in decent sunlight and watered it once a week.
And now here we are, less than two weeks to Christmas and as you can see above, at least four of the leaves have gone red. Lovely!