Looking for a KDE theme that is basically dark transparent boxes, sort of like with i3, where the titlebar can be made to match the "body" of the window. Bonus points if it comes with Windows-like corner buttons.

Pic related is what I first tried, as per recommendations here. It ended up being something of an eyesore. No guesses as to why.

Thought I'd try making KDE look a bit more like the "plain" windows of i3, but with transparency and shit.

Yes, I know, the windows should be darker. Problem is, I have no idea how to do that while also making it possible for the title bar to match. And even then, it's more apparent now that the title bar doesn't quite match the "body" of the window.