[Graphics] Window colour help

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http://www.kubuntuforums.net – Hi, I am slowly learning all the features of KDE by playing with it but am stuck on a colour choice... Here is a snapshot of the screen. The brighter blue colour that fills the window I cannot find to change anywhere. I have been through all the options in System Settings - Application Appearance - > Colours - > Colours -> Colour Set: It doesn't seem to be in there, I was wondering if it is set somewhere else? It's an obscure thing I know and not exactly vital to the use but it would be great if someone knew why it seems to be hard set. Thanks for your help! It is definately no (HowTos)