MinecraftForge/MinecraftForge — pull request #203 by micdoodle8 (2012-10-11 03:17:13+00:00)
Title: Allows modders to use a custom GuiSlot container background.

Example usage:

http://i.imgur.com/6CyTA.png

I understand this isn't a major addition into Forge, but would really help for the few people that want to change the background of a Slot GUI without editing base files.

If you would like anything changed let me know.