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My variation of Ubuntu Ambiance Theme:
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-different radius of upper window corners
-changed window buttons to squared ones
-nautilus with dark sidebar

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Installing the theme:
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1. download and unpack the .tar.gz.
2. get root rights and copy My-Ambiance folder to
/usr/share/themes/
(e.g.: gksudo nautilus /usr/share/themes/).
3. change theme using e.g. unity-tweak-tool
4. Comment & Enjoy

tested on Ubuntu 14.10.