How many states do desktop icons have (normal/default, active, prelight, focus, insensitive, selected)? And how may they easily visually be differentiated? My main problem is like this: If I single-click on a desktop icon (of a .png file), the icon gets a light-blue film over it and the text below has a light blue rectangle. Call it "State 1". (For the remaining icons on the desktop, the desktop wallpaper is visible behind the text and between letters of the text.) I can now hit enter to open it with Image Viewer. No problem so far. Then, if I close Image Viewer, the appearance of the icon and it's text is virtually unchanged but if I hit enter, the .png file doesn't open in Image Viewer. Nothing happens. Clearly, the icon is now in another "state", "State 2". Now, if I single-click on the icon and look carefully, the film over the icon appears very slightly brighter and then hitting enter opens the file in Image Viewer as expected. I want to have the visual difference between State 1 and State 2 to be enhanced. Are there some files I could edit to achieve this? I'm running Lubuntu 12.10 (and just a couple of weeks old with Lubuntu). (I could do what I wanted when I was using Ubuntu 11.10 and Nautilus: <a href="http://askubuntu.com/a/89929/25656">http://askubuntu.com/a/89929/25656</a>.)