Problem

Change the theme is one of the "killer-feature" of GNU/Linux desktops in front Mac0S o Microsoft Windows. In gnome2 was very easy to change and add new ones, but in gnome 3 this thing is more hidden, difficult to find and not enjoyable.

Solution

I made some mockups for future implementation theme selector as wallpaper style in gnome setting preferences, with new icon.

Mockups

Mockup 1(new system settings option)

Mockup 2(Theme selector with small and big autogenerator previews)

New icon

With a new metaphor it will be necessary.