Recently I’ve updated TheTool to support also AppIndicator3 interface so it can show icon in Unity panel.   Although the documentation is not saying it, you can use absolute path to PNG image as icon-name ( apart of stock icon name).   I was trying to add application specific stock icons, but is somehow did not work well (only possibility is to use  xdg-icon-resource install --novendor --size 32  picture.png icon-name,   but python code for creating application specific icons with Gtk.IconFactory was not working for me – see this post on stackoverflow). Continue reading AppIndicator3 – how to use custom icons →