Super useful addon if you're looking to beautify your UI by bringing background textures onto the screen to go behind UI elements. You can also add scripts to each "panel" you make so they dynamically change sizes or load only when certain things happen.

You can also bring in your own textures using this addon but it can be a little buggy. 

TESTED AND WORKING!

KNOWN ISSUES: Texture uploading can be finnicky, but there are ways around it by using SharedMedia