Ornament kits can be used on relevant armours and amulets to change their appearance. The decoration can be removed and put back into its kit at any time. Ornament kits are tradeable, but the decorated items are not. You may not lend an item that has been decorated in such a way.
Ornament kits can be obtained from Elite or Master Treasure Trails, another player, or bought on the Grand Exchange. Dragon kiteshield ornament kits can be looted from the King Black Dragon, and cannot be received from a Treasure Trail.
It is impossible to use two different kits on the same piece of armour; a dragon platebody (sp) cannot have a dragon platebody ornament kit (or) used on it, and vice versa.