This is a diamond chest and a gold to diamond upgrade. Both are from the Iron Chest mod. The diamond chest is essentially a chest that can store much more items than a regular chest, while the upgrade upgrades a preexisting gold chest to a diamond one.
Iron Chests mod download= http://minecraft.curseforge.com/projects/iron-chests/files
Iron Chests information on Feed the Beast wikia= http://feed-the-beast.wikia.com/wiki/Iron_Chests
Note: Sorry if the chest in the photo looks bad, I'm still transitioning from tape to glue. Also, if you don't understand what I mean by put onto back piece, there is a photo.
1. Click on the papercraft design image.
2. Make sure it has not been resized by your browser (you might need to click the image again).
3. Print using your browser's Print function.