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.
Swatches are built for and tested with the latest version of Bootstrap. Older versions are also available for download.
Changes are contained in just two LESS files, enabling modification and ensuring forward compatibility.
Check out these editor's picks from the paid templates at WrapBootstrap.