Jungle Quinn?
So just to mess around in a normal the other day, I played Quinn. In the jungle.
Hear me out:
Clearing: She has an AoE blind, so camps get cleared quicker AND stop dealing damage to you for a couple seconds. I started rock bros and took almost no damage between the blind and the smite stun: Blinding assault -> smite when blind ends to stun -> blinding assault again -> stun again is basically how it went. Those damn chicken raptors didn't do their infamously ridiculous damage to me while blind for two auto attacks each! And I had plenty of HP to clear out red buff and keep going. She also does tremendous damage with Harrier, which you can proc automatically or manually with E (But be careful not to waste your E cooldown if you know there is a possibility of being ganked/counter jungled and may need it for a fight).
Ganking: R. Her ult. It gives a huge movespeed boost that basically makes (intelligent) ganks impossible to avoid when combined with her gap-closer (rush at them, if they flash, dash, or jump, THEN use the gap-closer, but NOT BEFORE), she can blind them to prevent a counter-engage on AD champs, and her burst damage is ridiculous when you perform her rotation properly.
Other stuff: Her W is perfect, it's amazing and wonderful. She can always check to see if enemy jungler is counter-jungling, or she can make sure a lane she's ganking isn't also being ganked at the same time by the enemy jungler.
She's an amazing scout with nigh-impossible-to-escape ganks, heavy burst damage, excellent mobility and dueling capabilities, and an incorporated vision tool. Give her the chilling smite slow and she's a very formidable jungler.
Thoughts?

"I live behind enemy lines"
Black Cleaver, as a Brutalizer item, can be replaced with warrior enchantment jungle item, BotRK or ghostblade.
Frozen Heart is one of the best CDR items. Abilities and spellblade procs are big parts of Quinn's damage.
Banshee's Veil can be replaced with Mercurial Scimitar or with Zephyr + Berserker's Greaves.
This is somewhat a flying Irelia build, so if someone makes her popular, expect nerfs, especially to her E mana cost.