weird slime tornado
(must be in command block)


summon Slime ~ ~1 ~ {Size:7,Riding:{id:"Slime",Size:6,Riding:{id:"Slime",Size:5,Riding:{id:"Slime",Size:4,Riding:{id:"Slime",Size:3,Riding:{id:"Slime",Size:2,Riding:{id:"Slime",Size:1}}}}}}}

chicken jockey
/Summon Zombie ~ ~ ~ {IsBaby:1,Riding:{id:Chicken}}

rideable (not driveable (is that even a word)) enderdragon and wither

/summon Minecart ~ ~1 ~ {Riding:{id:"EnderDragon"}}

/summon Minecart ~ ~1 ~ {Riding:{id:"WitherBoss"}}

(careful with the wither one sometimes he can break minecraft blocks)

flying pig

summon Pig ~0 ~0 ~0 {Riding: {id: "Bat"}}

Mob tower

(put this in command block)

summon Zombie ~ ~1 ~ {Riding:{id:Slime, Riding:{id:MushroomCow, Riding:{id:Creeper, Riding:{id:Villager, Riding:{id:Skeleton, Riding:{id:Spider, Riding:{id:Chicken, Riding:{id:Pig, Riding:{id:Cow, Riding:{id:Sheep, Riding:{id:PigZombie, Riding:{id:Enderman,Riding:{id:CaveSpider, Riding:{id:SnowMan, Riding:{id:Witch}}}}}}}}}}}}}}}}

(and if you want it to fly)

summon Zombie ~ ~1 ~ {Riding:{id:Slime, Riding:{id:MushroomCow, Riding:{id:Creeper, Riding:{id:Villager, Riding:{id:Skeleton, Riding:{id:Spider, Riding:{id:Chicken, Riding:{id:Pig, Riding:{id:Cow, Riding:{id:Sheep, Riding:{id:PigZombie, Riding:{id:Enderman,Riding:{id:CaveSpider, Riding:{id:SnowMan, Riding:{id:Witch, Riding:{id:Bat}}}}}}}}}}}}}}}}}

if you have any suggestions of what to make pls post a comment