This is... so rainbow. Celestia's mane and tail, and Lady Rainicorn's body, make this such a trippy image to look at. I probably won't ever watch Adventure Time, but I do like Lady Rainicorn's design. Plus, it's ponies!
I...I have to fav this, I just have to. This is art of two of my favorite shows combined, and not only that but Celestia and Lady are each one of my favorite characters from both MLP and AT. And on top of that, this is really well done, the lines are precise and the colors are brilliant. And the embrace is just so darn cute! Wonderful job.