I support the recommendation to try some interesting layering combos. I started layering v-neck sleeveless tops over shirts (e.g. a pink/red striped v-neck sleeveless top over a crisp white shirt, or a black v-neck top over a blue/black patterned shirt), and those combinations rock. They took some getting used to, but have become one of my favorite looks especially at work.
Also, try new styles that you haven't considered before. E.g., I always thought "I don't look good in tunics/longer tops" and didn't even try them on. Angie successfully challenged that and I started trying some and finding that some actually worked really well. Now I have a few that I really like.
Finally, accessories can be a great (cheap) way to add zing. I love earrings and scarves, and often go out to buy myself a new scarf (the kind you wear indoors, not the heavier ones to wear with a coat) when I need new color in my wardrobe and don't want to spend the money for new tops.
But I also agree with Nicole that your "wardrobe boredom" could at least in part be timing related. I am getting very bored with my winter combos and just can't wait for spring. I just started looking for spring flats, and will start looking for other spring wardrobe soon. Once I have a few spring items, I will start to wear them in combination with winter things (e.g., a new spring skirt with winter boots) to bridge the seasons and to start having more fun getting dressed again!
Good luck!!
