This is the classic war poster "Keep Calm and Carry On" reworded to "Keep Calm and Trot On". There are silhouettes of horses by the side of the words. This design makes great presents for riders and horse/pony enthusiasts.
I've put this on a blue background, but you can change that really easily. Hit 'Customize it' and then 'edit', and you'll be able to change to absolutely ANY color you prefer.