It’s been my experience that good designers who commit to sustainability in their practices end up creating work that is not just conceptually innovative, but also, nine times out of ten, beautiful to look at. The challenge of working within certain strict parameters, pushing to use materials and processes that are often more out-of-way and less obvious, can produce really dazzling results.

Here’s a case in point: The delicate, architectural stoppers of these decanters are made of found scraps of glass—remnants collected by the designers Ezgi Turksoy and Kacper Hamilton in a glass workshop in London. According to Dezeen (where you can see many more photos), the designers found inspiration in the accidental loveliness of the shapes caused by flaws that occurred during the glass-blowing process.

These original, delightful pieces embody the kind of inventiveness that can make sustainable design more interesting, and more beautiful.

The decanters will be on display at the Mint shop during the London Design Festival in September.