Switch both your colour scheme and your theme at the same time, between a "light" and a "dark" set of settings.
Released under the MIT license. See LICENSE for details.
Open the command palette, choose "Package Control: Install Package". This prompts you for the package to install.
cd <your sublimetext 2 packages directory>
git clone git://github.com/schnittchen/sublime-helios.git Helios
There are only four settings to configure.
There is a default configuration file, from which you can take all available options. Put your configs into your user configuration file. Both can be found in the Preferences submenu.
Noel Cower wrote a combined theme and colour scheme switcher which can be found here. Packaging and improved settings management by Thomas Stratmann.