Murrina-Neutrino is a GTK2 widget theme is intended to be used along with Compiz-Fusion (Beryl) Emerald theme called Neutrino.
The idea is to replace colours in widgets and window borders by other means of design, making prolonged computer work more comfortable and relaxing.
There are three similar GTK themes based on different engines. All allow colour customization.
For Murrina-Neutrino and Aurora-Neutrino you may have to install the appropriate GTK2 engine (on Ubuntu Murrine and Aurora are not installed by default). Check your repository or find them at: