Crop Tops: No or Go?

I'm kind of falling for the crop top trend. Although I'd have to do about a million crunches before I could wear one myself... I think it's a fun and tasteful way to show a little skin when done right. I've seen a lot of looks where crop tops are worn with high waisted skirts or shorts, but for the summer months they're now being paired with a completely exposed midriff. So what do you all think? Should they only be worn with high waist pieces? Are you loving this trend or should midriff's be kept covered?

all pictures from pinterest