Oxygen Crystal Diamond… or KDE4 Oxygen v4.6.2, Crystal Diamond and Crystal Project Icons ported for Plasma5.
Beware, that the package is a big one. Contains all the folder themes released until then for oxygen, which can be found in Extra folder. Also contains the old KDM faces and other sweeties 
Has few issues, which i will try to fix.
Suggestions are very welcome.
Now it’s time to recreate the old plasma theme - maching the crystal style.
Hey we are not living in flat land, i am sick of these flat icons, themes, windows, shhts.
Download it, use it, if you don’t like it, it’s OK, if you like it - that’s great.