Who doesn't like fresh flowers? It doesn't have to be anything fancy. Just pick up a bouquet at your local grocer and put them in your favorite vase!
Potted herbs are a functional and pretty way to add greenery and life. Pick some pretty pots that fit nicely in your kitchen window above your sink so that they are easily accessible.
For the gourmet chef at home, install some shelves in front of your windows to provide more space for a variety of herbs!
[photos from Architectural Digest, Elle Decor, Better Homes and Gardens, and Decor de Provence]