This resource pack REQUIRES Optifine or it won't work!
Simply adds a corresponding colored GUI for each Shulker Box color. Makes it easier to distinguish one from another when you're looking for something. Looks pretty neat, too.
Three additional files are included in the download along with the regular version: a version for legacy colors, and two tweaked versions with rounded corners for both color palettes.
If you get this...
..there are two things you can do. The first is change your language to any English language (Canada, UK, US, etc.).
Or, rename the en_us.json file included with the pack to the technical name of your Language.
Then it should look like this: