The steampunk ponies are on my to-do list. There are a ton of steampunk takes on them, which is not surprising considering that in the show itself the only vehicles that have ever been seen are horse-drawn carriages, steam locomotives, airships and this contraption:



In the meantime, here's one of the songs arranged in a instrumental steampunk style:




And for those with a more dark and twisted sensibility, here's a video explaining how they make rainbows in a world of candy-colored ponies (not for the squeamish):