This is an emerald theme that I made for use with kwin's smaragd extension (though it should work just fine with compiz, as well). It's partially derived from porl's "Iridescence" theme. I made it for use with this wallpaper (unsure of copyright/licensing on it): https://i.imgur.com/vRD9l0F.jpg and a glassy QtCurve theme that I designed. I also made a Qt5 colorscheme to go with them (https://www.opendesktop.org/p/1277651/). Hopefully there's somebody else out there who still likes non-flat gradient-based themes