http://kgtz2pmmov5jfvn3z4mqryffjnnw6krzrgxxoyaqhqckjrr4pckyhsqd.onion/eudaimon/ow-two
The goal is to widen the scope of supported apps and especially mime-types, while not recreating an entire icon theme. Oxygen is an old theme and as far as I know, no new icons have been added for a long time, so its shiny and glossy appearance is less and less present over time.