Make a rap about ponies? I'm not on tumblr or whatever that is but rapping about ponies, I'll give it a go:
...for all my homies in the G1...
Ponies, Ponies, owning them is cool.
I got so many it makes you wanna drool.
I got Rapunzel and Sweet Scoops and Cherries Jubilee
but there ain't no shame in owning one pony.
If you wanna be happy, do just like I do...
own a MLP so you can be cool to.