Kitchens can have a very square box look because of all the right and left angels used to make cabinets. But you can soften up the look of the space just by adding a arched or curved valance to the space. Another way to soften the space is to use an angle cabinet at the entry way or at the end of a run of cabinets. This will also open up the space.
Here are before and after photos of a recent remodel in Orwigsburg, PA