i've recently switched to qBittorent as it provides what i need and more this far.
I also put the darkstylesheet.qbtheme and it's amazing. But it doesn't seem to be the official skin, although it works perfectly.
If i ever help someone install a torrent manager, i think having this skin as a default choice instead of telling him to download it from github, which already isn't that friendly, and putting it manually would be best. It works good and is a perfectly good dark skin. I would advise talking with the creator (if he isn't part of the team already) and putting it in, would make life so much simpler and would attract more users.
https://github.com/jagannatharjun/qbt-theme
For reference
