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I know it's old fashioned, but I happen to like the crystalsvg icon set.
I also happen to like my interface to be consistent across GTK and TDE applications.
If you happen to feel the same way, then grab the GTK crystalSVG icons from https://www.gnome-look.org/p/1253578/
Unpack and copy to /usr/share/icons
Use whatever tool you prefer to configure your gtk apps to use crystalSVG and away you go.
There is of course the gtk-qt-engine-trinity config tool in the repos - I happen to prefer doing it by hand with the relevant config files.
The other thing which drives me nuts is the GTK default of NOT listing directories before files - despite that being the pretty universal standard elsewhere.
So, install dconf-editor and use it to search 'directories' and then set to show directories first.
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