Oh yes, I use Kvantum theme like I mentioned here so that all qt apps look okay. Hidden folders/files must be different color (or transparent) - #39 by sglbl
You can also try Big Linux KDE on DistroSea Test Big Linux online
Instead of kde's default breeze theme, they include really modern looking theme with a lot of extra option. It's KDE so you don't need to install extensions for everything unlike GNOME. It has a dock and top panel and so many free desktop layouts and it's completely free.
