Hey everyone!
Since I bought a 4K screen, I was dissatisfied with XMPlay skins being much too small. I soon took matters into my own hands and wrote a web-based tool to automatically scale skins to arbitrary sizes and at the same time, Ian added "Big" mode for simple pixel doubling.
However, proper 4K-skins were still missing. When I found the old 3dsmax files for my 2004 "Plastic" skin, I converted them to Blender and gave them a proper cleanup, re-rendered everything in high resolution and made "Plastic 4K".
Since the original skin was from 2004, some features are missing that you may know from other skins, like more than 5 EQ bands or a 5-star rating. The original also didn't have a "Library" button in the extended playlist, which I added for this version.
The skin is attached as .zip - simply rename it to .xmpskin and it should be picked up by XMPlay.
Enjoy!