Restorable Quest Item From Death Knight Starting Zone (Patreon)

The item "Gift Of The Harvester" is a quest item given to you during the Death Knight Starting Zone. If you have ever levelled a death knight you will likely recall a quest called "The Gift That Keeps On Giving" , where you have to turn a number of scarlet miners into ghouls using the aforementioned device.

This item can be deleted and subsequently restored using "item restore". This means it can be used after you finish the starter zone as it will be sent to your mailbox. It is essentially a vanity item that produces green smoke when thrown at an npc. 

The item "horn of the frostbrood" which you use to ride a skeletal dragon near the end of the quest chain can also be restored. However, it seems to be zone-specific and non-functional. 

There are a large number of zones which are essentially locked after completion and have items which could potentially be restored, it may well be worthwhile experimenting further with this method.