$for i in "/usr/share/icons" "/usr/share/icons" "/home/manuel/.kde4/share/icons";do echo "------- $i";ls -1 "$i";done
------- /usr/share/icons
Adwaita
default
default.kde4
Faenza
Faenza-Ambiance
Faenza-Dark
Faenza-Darker
Faenza-Darkest
Faenza-Radiance
gnome
hicolor
HighContrast
Humanity
KDE_Classic
KFaenza
locolor
mono
nuvola
oxygen
Oxygen_Black
Oxygen_Blue
Oxygen_White
Oxygen_Yellow
Oxygen_Zion
------- /usr/share/icons
Adwaita
default
default.kde4
Faenza
Faenza-Ambiance
Faenza-Dark
Faenza-Darker
Faenza-Darkest
Faenza-Radiance
gnome
hicolor
HighContrast
Humanity
KDE_Classic
KFaenza
locolor
mono
nuvola
oxygen
Oxygen_Black
Oxygen_Blue
Oxygen_White
Oxygen_Yellow
Oxygen_Zion
------- /home/manuel/.kde4/share/icons
hicolor
nouveKDEGray



$ cat /usr/share/applications/qtcreator.desktop 
[Desktop Entry]
Exec=/usr/bin/qtcreator
Name=Qt Creator
GenericName=C++ IDE
X-KDE-StartupNotify=true
Icon=QtProject-qtcreator.png
Terminal=false
Type=Application
Categories=Qt;Development;