Linux: Finding new, good-looking and complete themes for Linux systems can be a serious scavenger hunt. The Bisigi Project provides 13 free, well-rounded themes you can install all at once, customised for your monitor size. Take a peek at five of them.
You'll need to pull off a few terminal commands to install the Bisigi repository in your Ubuntu, ArchLinux or Frugalware system, but copy-and-paste code is available at the Install page. Once you're set up, head to where you choose themes for your system (that's in Appearance, under Preferences, on an Ubuntu system).
Each of the 13 themes Bisigi provides has a chosen icon set, a suggested wallpaper and colour tweaks that you'll see throughout your system. One theme, Airlines, switches its wallpaper as day turns into night. Here's a look at five of Bisigi's themes, installed on my Ubuntu system, with a Docky dock at the bottom showing some of the folder/icon changes.
Bisigi's theme package is a free download, available with supported repositories for Ubuntu, ArchLinux and Frugalware systems, or as a source package that most Linux users (on GNOME-based systems) should be able to extract themes from. Thanks to Jordan Conway for the tip!