A modified Ambiance smoothed and slightly flattened. I wanted to create something less tacky than the default Ubuntu Ambiance but still feel like Ubuntu.
When github is down, Ubuntu users can use the Noobslab ppa to download this theme. Visit http://www.noobslab.com/2016/01/yosembiance-smooth-and-sleek-theme.html. Please note that this theme is currently being updated on a daily basis and this ppa may be outdated quickly.