Making monster mobs more interesting in creative mode [closed]

I have Minecraft, and tend to play in survival mode.

My children like creative mode. As well as buildings and rollercoasters, they have started to be interested in creatures, and recently switched monsters on, treating them as "pets". I have helped them create "monster zoos" using spawn blocks etc.

The monster behaviour in creative mode is somewhat boring though. The children don't really want to fight the monsters, but might be entertained if they fought each other, or acted with some simple purpose. Even sheep tending to climb up are more entertaining than zombies on creative mode.

Are there ways to get a more interesting or entertaining behaviours out of the Minecraft monsters, when in creative mode?

Examples of things mobs do or have done that my children have found interesting:

• Witches taking potions when hurt

• Monsters getting into minecarts and riding rollercoasters

• Iron golems protecting villagers, and giving them flowers

• A "baby crowding waterfall" that happened to a mooshroom where they made it spawn around 100 babies, which then pushed it around (and mostly downhill) as the ones at the back tried to get closer.