Take any Champion in LoL and make it horrible/OP by butchering/enhancing any of their abilities. Have Fun. ex. Jinx's Super Mega Death Rocket: Launches 5 rockets across Summoners Rift locking on to all champions. ex. Rek'Sai has a max of 3 tunnels ex. Teemo Noxious Trap is global so he can throw them to any place on the map ex. Akali is revealed if she moves within her W
Voidlings AD scaling is changed to AP scaling.
Or Voidlings expire after a minute, instead of 21 seconds. Long live AD Malzahar!
Lee Sin now has insane sustain, mobility and damage despite building tan-- Nevermind.
Nidalee's spear now travels through units, dealing damage to everyone while still becoming stronger as it travels. The hitbox is also increased.
Nod at the bird and people die........
Ruin: Tibbers summons Annie.
Godify: Nasus now rides Baron into battle. Just kidding, he's already a god.
Allied champions can now ride on Hecarim, giving a 50% increase in movement speed, while both champions are free to use abilities.
give his stun a 0.75 second dela- oh...wait...
riven 
Cho has unlimited stacking on his ult. So just farm safely for 30 minutes, than have 10,000 hp
Leblanc reverted to release state.
E now lasts until an enemy is hit. Hecarim will continue to gain movement speed during this time.
Press E at the start of the game two minutes later you'll be at 600 AD and have 2000 MS
's Q now has 300/600/900/1500/3000 + 200% AP scaling. Enemies hit by Q are rooted in place for 5/10/15/20/500 seconds. This effect can not be cleansed by QSS.
's W now has global range turning all enemy champions into cupcakes. If an ally eats a cupcake the enemy is instantly killed. Her speed boost effect also initializes at the same time for 3000% movespeed bonus.
's E now shields all allies globally for 5000 damage passively. This shield regenerates at 4999 shielding per second.
's R is now reworked to be Karthus's on steroids dealing instant death for enemies irregardless of range or defenses. The cooldown is 20/10/0.
OP enough for you ;) ? Oh.. and her mana pool is increased by 500 per level.
can only have 1 shadow out at a time.
ult hits all champions around him, if he gets a kill he can use it again, each kill refreshes it again and again up to maximum of 5 times.
Ruinification:
now uses a fatigue system. Fatigue builds up progressively on continouus ability casting and needs 6 seconds to decay. On full fatigue, Riven gets slower with each ability cast. But wait there's more! Fatigue can overbuild, and it does that quickly! 200% fatigue, so to say. And when it reaches that, Riven gets stunned for 3 seconds. Fatigue decays slowly after that.
Godification:
's ult now roots and supresses his victim for as long as he wants. Have fun turning enemy ADCs into pets.
Malphite's ult range reduced to 450. It now has a 1.2 second cooldown.
Godify: 
Passive has no cooldown.
Acceleration to maximum speed is twice as fast.
Ruin: 
Half souls are lost on death.
Concussive blows stacks can only be applied from Braum. (And only Braum)
ALL OF INSANE IDEAS (cant think about making it horrible, just OP-ing)
Q now snares all enemies in distance for full duration
R range is now global
R cooldown is now refreshed if get kills during duration and halved when get assists during duration
R cooldown is now refreshed if the target is killed during duration
R damage is now true damage and halves the cooldown when it kills target
R increased range is now global
R cooldown now halved if gets kill, next use have 50% more damage for each multiple kills... capped at 200% more damage at PENTAKEERU!!!
W passive now heals double when Q accidentally KS...
R cooldown now refreshed and mana now refunded when healed allied champions kills enemy within 5 seconds
Ult is now an aimable cone that can hit multiple enemies.
Q: Longer Range, Wider Radius, More Damage
W: Remains active so you can actually fly
E: Big Range, More Damage, Keep up the Armor Penetration
R: Shoot two missiles at once, lock on for homing range, can hit only champions
Q: Put as much turrets as you like
W: Lock on and hit your target with multiple missiles
E: Keep those bombs bouncing
R: Endless upgrades
Q: Throw those bombs, bigger explosions
W: Plant charge on the enemy and detonate it at anytime
E: Big minefield, Big explosions
R: https://www.youtube.com/watch?v=IXTJlH7g0tw
reduce range to 325 from 400
oh wait... 
Teemo becomes manaless.
Ezreal's Q now has a 1 sec cooldown
Karthus skittles now detonate instantly.
Nidalee spears act like Kalista's pierce. Meaning going thru a unit upon death.
Shaco's Hallucinate is now like LeBlanc's clone, doesn't do any damage.
Nasus Q now refreshes CD upon minion kill.
Annie tibberz has a 1.5 sec delay.
Kassadin passive and Q shield now block/reduce all damage, not just magic damage.
Riven's shield scales off armor/Mr or mana (lol).
Turning shadows off in your options now invalidates zed's W and R. In order to compensate for this zed is given 5 aP per level.
Fiora ultimate no longer procs tiamat/hydra but can still be blocked by a Jax counterstrike.
Braum shield now blocks all projectiles for the duration and he takes no damage.
Lux ultimate refreshes upon kill or assist.
Ahri charm gives you control of the enemy champ for 6 seconds
I'm really bored...
Q: No longer needs the double bombs to stun the target. Single bombs do it now.
W: Now completely refreshes cooldowns instead of droping 10 seconds off them. This is including his ultimate.
E: Now stacks with itself when used by rewind. (198% speed boost or slow)
R: Global range.
-Insert Any Champion- With 80% Cooldown reduction, no mana costs, and extra Tenacity.
Oh.
Olaf:
Becomes manaless and health-based. Undertow mana cost removed, replaced by a health cost that is refunded if the axe is picked up. Vicious Strikes cost removed and grants 9/12/15/18/21% Spell Vamp as well. Ult no longer removes passive defenses and increases his movement speed by 40/60/80 instead of attack damage.
ult makes his staff extend across the entire map and damages globally. cooldown on ult 30 seconds
Tunnels are now global and coming out of one activates a knockup AOE larger than her normal one, but she doesn't come unburrowed.
Q now deals 100/200/300/400/500 + 1.0 AP to all units within 1000 range and silences the targets for 5 seconds
All champions: No change. They're pretty much all either Godly or ruined already.
Q: Now hits everything in its path, and immobilizes instead of blinds.
W: Now reveals the entire map.
E: Cooldown resets every time you attack someone marked by your passive.
R: Quinn now randomly fires arrows at targets, dealing the same damage as your passive empowered hit to random enemies around you while controling valor.
Godify Heimerdinger's ult now works for all of his spells for 7 seconds, and reduces the cooldown of each spell to 3 seconds.
Rammus's E's range is now 2500 units and lasts as long as it takes to hit Rammus.
During Galio's ult, Runic Bulwark now heals for 400% of the damage taken and reflects the damage.
Ruin Karthus's Q now can only be used when Defile is inactive.
Ahri's Q now shares the cooldown of her W.
Rek'Sai's tunnels cannot be right-clicked for use.
Ruin:
can only have a maximum of 3 stacks for her rend
passive now has a 5 minute cooldown
Godify:
ult now damages buildings [ well can do it]
Fiora's ult deals true damage on every hit, also applying on hit effects.
Go back to patch 5.4
passively afflicts moonlight to nearby enemy champions every 5 seconds.
Miss Fortune Q : Double up now called "Penta Shot" > Bounces 5 times and damage increases with every bounce. Also can bounce in a 360 degree radius R : Ult now roots champs in the cone when cast for 2 secs
