SMplayer icon theme based on KFaenza [link]
To install, unpack files to /usr/share/smplayer/
Also you can install it for current user only(just unpack archive to ~/.config/smplayer/)
For activate theme, open preferences(Option->Preferences or just press Ctrl+P), select "Interface" on the left then choose icons in "Icon set" combo-box on the right.
Also you can download it here [link]