Above the kitchen
When I had my kitchen done years ago I had space above my cabinets. The kitchen I have now has no space, so I don't have to worry about it. A few weeks ago I was traveling through some design forums and came across a question that asked what to do with that space. I thought that would be a great topic.
My first tip is this: You will find that so much dust will land on the top of your cabinets. Typically the cabinets are unfinished which means they are rough and everything sticks to them, including greese. Do yourself a favor and line them with newspaper. Don't worry, you can't see it from floor level. Every couple of months you take that newspaper down and replace it with new. This will safe you tons of work.
I find that the nicest way to decorate is to group a few objects together and display them leaving the rest of the area plain.
I love the greenery up there but I have to admit, it does get very dusty. You can put together silk flowers, baskets, decorative plates (they better be big or you won't see them very well), vases, art work, antiques, books and pictures. Anything goes. Grouping them in such a way that it makes sense. You're done and the top space above your cabinets look great.