Here is a cool theme pack I was using last month for my Ubuntu desktop. The theme color for this customization is green. So, I have included a green login screen, a green theme, and a green icon pack with a green wallpaper.

Wallpaper

This Wallpaper is from Deviantart :

Ubuntu Wallpaper

The download page goes here :   Here.

Theme

The theme is named “Aqua Dreams.”

Ubuntu Theme

Get the theme Aqua Dreams :   here.

GDM

An excellent login manager theme to go with this theme.

GDM MAnager

The link is : Leaf Gnome.

Icon Pack :

Icon pack lets you change all system and GDM icons.

Ubuntu Theme pack

The Icon Pack is from this website.

That is all the way to going green. Do not forget to share your desktops, screenshots.