Glass is simply a "Must have" in a Scandinavian interior, however, in any style room glass provides some kind of lightness, elegance, sometimes luxury and or even elementary simplicity. It depends on the glass itself and shape of the vase.
Flowers, soaked in simple glass vases look really nice (beauty is hidden in simplicity) combined with glass candlesticks and other interior accessories. In addition, glass vases look attractive without any flowers too, reflections and transparency give specific charm. Now there are a lot of crystal products and you can acquire similar products in H&M Home shops.