How to add an icon for IntelliJ. Update the Icon and Exec to where you unzipped idea-IC-135.690.gz and installed IntelliJ.

intellij.desktop

// create file:
sudo vim /usr/share/applications/intellij.desktop
 
// add the following
[Desktop Entry]
Version=13.0
Type=Application
Terminal=false
Icon[en_US]=/home/daniel/idea-IC-135.690/bin/idea.png
Name[en_US]=IntelliJ
Exec=/home/daniel/idea-IC-135.690/bin/idea.sh
Name=IntelliJ
Icon=/home/daniel/idea-IC-135.690/bin/idea.png
 
 
// modify permissions
sudo chmod 644 /usr/share/applications/intellij.desktop
sudo chown root:root /usr/share/applications/intellij.desktop

// and voila! Hit Superkey and search for Intellij to view the icon. It can be locked to the launcher.