This article from Iowa State University Extension is a nice overview for the care of these classic holiday favorites.
There are many colors other than red to find in poinsettia - white, pink, speckled, marbled, even gold and green! Click here to see some of the many colors and varieties of poinsettias you could find in the store.
These large sub-tropical bulb can be easily brought into bloom during the holidays. More information about care of this large beautiful flower can be found in this article from Iowa State University Extension.
While often you find these bulbs sold with potting soil for planting, you can also find them waxed. This is an interesting way to grow this flower, but bulbs cannot be forced to rebloom once waxed.