You're currently previewing the themes for Bootstrap 3.0.0-rc2. These are still a work in progress. If you want to see version 2.3.2, visit bootswatch.com/2/.
Simply download a CSS file and replace the one in Bootstrap. No messing around with hex values.
Bootstrap themes are licensed under Apache 2.0 and maintained by the community on GitHub.
Themes are built for the latest version of Bootstrap. Older versions are also available to download.
Changes are contained in just two LESS files, enabling modification and ensuring forward compatibility.
An API is available for integrating with your platform. In use by WPBS, FusionLeaf, BootSnap, and others.