Several rolls/varieties of tape, one of those Swiffer small handheld dusters, a vase with flake flowers, and a replacement filter for the cats' water fountain.
You would hit the jackpot with me..apart from the cat (he has a blanket up there) and a very sad pot plant, a large plastic coke bottle full of coins...better go cash it in just in case..lol
Nothing at all.... years ago it would have been Chrissy, she had a bed up there while we were going through introductions. Food and water too. She had a overstimulation problem and could attack at a moments notice. There is absolutely no way they could steal her, she was WAY too protective of her spot and feisty!
My girls have never been into climbing on top of the fridge.
Aside from the bouquet I have a small tin bucket with sharpies, pens, pencils and a small exacto knife, a basket with vitamins, a handwritten cookbook of family recipes DD one doodled in, the kids headphones, a couple small toys that got taken away at some point, bubbles and a rock. Most of that stuff was put there to be inaccessible to kids but my DD is just under 5' already so now it's just...there.
A dish drying rack, a couple of empty wicker baskets... and a cat!
I wouldn't normally keep anything there at all (I'm pretty short), but my apartment is low on counter and storage space, so I keep odds and ends up there.