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It would be nice if the colour of the plasma set changes according to the current wallpaper of the desktop. This makes the desktop more interesting as the wallpaper matches with the plasma set.
I hope this won't be much of a problem to be implemented on kde plasma, as it is much more capable than the windows equivalent.
I've seen this feature enabled in Unity. That is what inspired me in posting this request. I hope this will be implemented soon.
Here are some screenshots:

Windows 8
http://winsupersite.com/content/content/135807/w8_m23b_wincolor_02.jpg
http://winsupersite.com/content/content/135807/w8_m23b_wincolor_04.jpg

Ubuntu Unity
http://cloudfront.omgubuntu.co.uk/wp-content/uploads/2012/05/chamelon-ambiance.jpg