A whole scene of Canterlot and Ponyville together and they're all vectorized, AND also in a huge resolution.
Those who wants to use the background or even do some modifications, do let me know, I'll give you my permission and even those who wants to use the Adobe Illustrator file, be my guess. I'll be providing it too if you're interested.
Note that the color is not 100% accurate and I didn't illustrate this myself, I use a special software called "Vector Magic" in order to achieve this result.
EDIT : AI file available AI download
My Little Pony (C) Hasbro