This is an extremely simple mod whose function is to change the rendering texture of chests to a Christmas-themed texture. It comes in two versions: a mod version and a Java Agent version, both of which have been open-sourced on GitHub.
Usage for the Java Agent version:
- Download and save the file to your local machine.
- In the launcher's version settings, under the advanced startup options or advanced settings, add
-javaagent:<file path>to the JVM argument header or JVM virtual machine parameters.