I love this friendship. The only word to describe this kind of fanart is "friendshipping", which is like normal shipping but you take the romantic/sexual connotations out. Usually you just show two characters hanging out or, in this case, sharing an innocent and adorable hug.
Ah... this episode has me with so many mixed feelings. On one hand I like the fact that they bring Discord back and his part in the episode was awesome but I did like him better as a villain with a certain sense of mistery and malice to him. I don't think I'll ever warm up to this pairing but I'll admit, this picture looks pretty damn impressive.