Board Thread:Questions and Answers/@comment-1661144-20130310120651/@comment-24.42.184.89-20130413232243

If you take a Diamond and right click it onto the latch you can see on the front of the Ender Chest (the latch has its own hitbox that pops up) it will make the ender chest part of a seperate network that is specific to you so if someone else had also done the same thing with the same color combonation they still would not conflict. This also gives the item some descriptive text stating who the owner is as well as visually changing the item icon.

I do not know of any way to reconvert it back into a normal ender chest however.

Bags can be configured into this "Privatized" network.