This is the time of year I divide my plants and look into trading/buying a few for next year. Have you ever considered using ornamental grasses in your yard? I just love them and you can see a few I have in my yard and learn a bit about them in this article:
http://hometipster.com/ornamental-grasses/ Do you have room to try just one?
One of my favorite ornamental grasses is Pink Muhly Grass.
http://pinterest.com/pin/234890936786128850/