Ok this might be too weird but it might work. If you're not into knick knacks, what if you apply one of those wall decals with a saying in the space. You can find them at Target or there are a few websites that let you customize your own saying or quote (Google "custom wall decal" or something like that).
Then if your space allows, put some rope light on top of the cabinet (close to the wall corner so no one can see it). It will add a soft glow and really bring your eye upward making the room look taller.
I did something similar for the built in china cabinet in my dining room only since this is so low, I lighted it from the top instead of below. I couldn't come up with anything clever for the quote so I just used a generic one. http://www.craftster.org/pictures/data/500/medium/203065_28Dec09_photo_2_.jpg