This is what I use to make Nintento games so why don't you try it yourself? There are two ways to do this, you can make a remix and draw it or load in a image, or you save save this default game case as a image then go to a drawing/editing site and make it there such as Pixlr and paint 3d. I say use Pixlr cause that's what I use. There is also a default game smash reveal and Amiibo so go do that!