I'm a sucker for vintage vases and flowers. They make me so happy. There's no better way to bring some beauty into your home then flowers, even if it's just one in a tiny little vase by itself. And I love finding old jars and vases at flea markets to use in my home. I found this huge apothecary jar at the Rose Bowl Flea Market years ago. It's perfect when I go out and cut a ton of flowers from my rose bushes. 
But the mouth is really wide so as I add flowers they just flop about. I don't have a large enough frog for the bottom so I simple add tape to the mouth of it. I usually use floral tape but most tapes would work fairly well too.
Happiness in a jar!