The Pony API

artist:countcarbon, book, candle, crossover, curtain, dark, derpy hooves, doctor who, featured image, female, floating, hidden derpy, inkwell, interior, latin, magic, magic circle, mare, moon, night, pegasus, photoshop, pony, runes, safe, smiling, solo focus, staff, stars, tardis, telekinesis, twilight sparkle, unicorn, wallpaper, window

API docs