A bunch of items for quests with events: Model Ideas on right:
Multiple Colored Keys (Ex. Blue Key, Red Key.[For access to places]) - Key Model
Wood (Maybe Different Types.) - Just a plank
Artifact (Maybe similar to keys, colored) - A pieces of china, colored greyscale?
Ore (Maybe Different Types.) - A block
Blocko Head (Blocko Head 1,2,3 Maybe[for slaying bosses quests]) - A head of a blockhead?
Plant (Maybe Different Types.) - Something in a green tint.
You can think of random things to put.
If you wish for this to happen, it could change rpgs. My (Secret Project Here) is an modless rpg (exept server mods of course). This would accelerate is progress to only one part needed, bots.