Call me crazy, but the idea of covering those little eyesores we call speakers with nice, clean boxes makes my visually-inclined soul so happy. SO happy. (It's all about the details, people!)
If you're of a similar nature, check out this tutorial for making your own wooden speaker box covers over on A Beautiful Mess. I love the white version shown here, but these would look great left in their natural Birch state or even painted another color that matches your decor.