Above are 3 ways I would style a crop top!
There was a really cool Zara-inspired one selling on Intoxiquette some time back, with flutter sleeves, that was paired beautifully with a slinky black maxi skirt (yes, I stole that idea for the second set!): but unfortunately, before I'd made up my mind, the top had sold out :(
I did still like the idea of a jersey maxi skirt, though, so recently I bought one from H&M for $24.90. I personally seldom wear black so I bought it in navy instead, and it's so beautiful: clingy in the right places, with side pockets that don't bulge! Can't wait to wear it out.