A new breed of jungle item
It seems that Riot likes to make jungle items that help the jungler but also have a unique property that can be abused in solo lane. I don't really understand this philosophy, so I came up with some new jungle items that help someone jungle, fill an item slot appropriately, and do not possess unique qualities to be abused in solo lanes:
Cinderhulk 400 Health Unique: Immolate - same as sunfire cape, but it activates when you enter combat like the current cinderhulk aura Unique: Jungler - When attacked by a monster, you regenerate X (+n% bonus health) health over 10 seconds
Devourer 50% Attack Speed 30 magic damage on-hit Unique: Jungler - Large monster and champion takedowns grant 1 stack of bonus on-hit damage (max 30 bonus stacks). This bonus on-hit damage is doubled vs monsters
Warrior 10% CDR 40 AD 10 Armor Pen Unique: Jungler - Dealing physical damage to monsters causes them to bleed for X% bonus AD over 3 seconds. (Alternate possibility: Dealing physical damage to monsters heals you for 10% of the damage dealt)
Runeglaive 10% CDR 50 AP 200 Mana Unique: Jungler - After casting a spell, your next auto-attack vs a monster deals 100% base AD (+30% AP) magic damage in an area around the target and restores 8% of your missing mana (1 second cooldown)
None of these has a passive that can be abused vs other players, all are still useful items. They are not as good in-lane as traditional lane items, though, so there won't be the current abuse cases.
I'm staying away from poacher :-) That's a whole different ball-of-wax.