Well, here are a few ideas I found to share with you (and no, fake ivy is not one of them!):
Plates- Snag some plate hangers are your local craft store and display a fun collection up high. You could go for a mono-chromatic look or embrace the beauty of vintage, mismatched plates!
Industrial Salvage- Whether it be letters, signs, panels, you name it! Large scale pieces of history will look awesome above your cabinets. The chippier the better!
Cake Stands! Stack these beauties up (safely) for a lovely, tiered look. If your cake stands aren't clear, you can prevent slippage when stacking by cutting out discreet circles of the rubber no slip pads that go under rugs!
Baskets- A great hiding spot to stash extra, non-essential items. Decor and storage at the same time!
I couldn't find any photos of these looks on top of cabinets, but I think they would be great: Vintage mixers, vintage blenders, or any vintage small kitchen appliance in a collection! Vintage bread boxes, wire crates filled with rolled-up vintage tablecloths, large vintage fans, apple crates, the sky is the limit!