It's obviously too late to order them for the holidays, but there is plenty dull winter left to brighten up, and a huge blooming fragrant houseplant is just what you need. We've got Amaryllis in green, red, and white–the Jade Serpent is my favorite. With up to 8 huge, lime-green to white blooms in just over a month, it is sure to give you the winter sparkle you're looking for.
It isn't all about the blooms. They grow so fast, you can actually notice the change throughout the day. A coworker who's desk is next to mine has been tracking hers every few hours for the last couple weeks. They are really fun to grow, and the spectacular blooms are really worth the build-up.
You can see here where she was keeping measurements for the the first nine days, from 12/15 until Christmas Eve. But now it's too big for this envelope.