Just download it into your "resourcepacks" folder and activate it (make sure it is the topmost of your active respacks to avoid interference from other packs).
Update: I also added the White Hand of Isengard ("skull") and a stained/damaged pattern ("bricks").
Update 2: Now includes shield patterns.
Update 3: Added Dol Amroth's Swan Ship ("square_bottom_right") and Durin's Hammer/Anvil and Crown ("square_bottom_left").
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