I love denim capris, they are very versatile. I would say for day, some cute espadrilles or wedges, and for night, dress them up with a pair of dressy sandals or stilettos.
The wedges look cute! Don't forget flip flops! For more casual looks, I pair capris with slim sneakers, like these asics or chucks. I wear low cut socks so you can't see them, or none at all.