[ubuntu] Unity desktop - icons missing, colours changed - ubuntu 12.04

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http://ubuntuforums.org – Hi Folks, I believe I'm running ubuntu 12.04, with the Unity window manager/desktop. My system has been working fine for months. This afternoon, I clicked on the System Settings icon in the bar on the left of the screen. (It's not labelled, so I can never remember what Unity calls that bar.) I think I then selected "appearance". I did not change anything. Almost immediately after that a number of icons disappeared from the bar - I can still hover and get their names, or click on them, but there's no icon. Several screens have changed from purple to blue. That wouldn't bug me - it (Hardware)