New idea?

Ok so now i have over 18 characters i can use it's just , i need more ideas. I'm writing a story currently in google docs that is not related to mlp. so I need more ideas for stories.

How does this sound:
An old friend of Rarity's builds a beauty machine that can change personality and cutie marks as well as the look (with a little brain washing and ID printing). Rarity starts to use it in her shop and a shady costumer sets the machine and pushes Rarity inside.

-Toxic