In general, Earl Grey is a one-person project. The best way to contribute to the project is by reporting issues, rather than submitting changes directly. It is unlikely that large changes to the color scheme itself will be accepted.
If you have a problem with a particular implementation, or you would like to discuss a new implementation of the Earl Grey theme, please open an issue first before opening a pull request.
Contributors must agree to license their contributions to the project under the Apache 2.0 license.