Brilliant Brainstorms is a weekly-ish summary of some of the best/most interesting brainstorms from the Ubuntu Brainstorm site.

In order to promote sharing of really cool themes and to help anyone who likes to switch between a couple of different themes, it would be great to include an easy way to save a complete theme.
An easy way to provide some choice of theme would be to simply keep the old theme as an option for anyone that wants it. Eventually, a reasonable collection of themes could be available, just by including the old themes.
In the case of root applications and Wine applications, the theme on them often does not blend in well with the system. It would look much better if there was a theme for those applications that made them blend in, possibly with some indication that they were WINE/root apps.
When your screen is “locked,” either manually or by the screensaver, you just see a grey login box. Instead, it would be much better if the box was themed to match the rest of the system.
If you can have themes for your windows, why not for sounds, too? Now you can switch between lots of different annoying sounds. Can I have a “silent” theme?