The Eclipse Color Theme plugin makes it possible to switch color themes conveniently and without side effects. It includes the most popular themes from eclipsecolorthemes.org, but you can add any theme created on the site by exporting it as XML.
If you are on Eclipse 3.6 (Helios), the easiest way to install the plugin is from the Eclipse Marketplace. Go to Help→Eclipse Marketplace..., then search for Eclipse Color Theme and install it.
If you are on Eclipse 3.5 (Galileo), go to Help→Install New Software..., press Add Site and enter Eclipse Color Theme as the name and http://eclipse-color-theme.github.com/update as the URL. Then select the new entry from the select box labeled Work with, mark Eclipse Color Theme for installation and proceed.
Please note: If you are using a version of the plugin lower than 0.6, please uninstall and reinstall it following the instructions above. Update site and plugin ID have changed.
After the installation, go to Window→Preferences→General→Appereance→Color Theme to change the color theme.
If you have a feature request, create an issue or a pull request on GitHub.