Jizz

The first troll was 10,000 years ago It appears he showed his genitals to a horse and his friend painted it.

funny

Paint [m]e like one of your horse friends jack.

gonewild

[50/50] Kate Upton Topless covered in body paint | A man fucks a mare while wearing a Horse mask (NSFW)

FiftyFifty

Painted Horse? How about a Painted GIRL

pics

A painted horse? What about a painted lady?

pics

Painted dog and horse?? How about a painted weiner! NSFW

pics

It appears the horse painting is possible foreshadowing for the events of the episode. (SPOILER)

rickandmorty

I ran my horse mask painting through Google's Deep Dream thing... (somewhat nsfw)

HorseMask

Nikki Sims - Nipple Painting ["It's a horse!"]

nikki_sims

Painting her underside in horse cum (Toyomaru)

HentaiBeast, GameOverGirls

Terrible painting of horses

worldpolitics

Good morning, here's a terrible painting of horses with freaky eyes

worldpolitics

Good morning, a terrible painting of a horse crying skittles tears

worldpolitics