Well typically when I make these images, they are already hosted on the Internet, usually as a .png. I convert those to a .gif and group them all together. I've searched everywhere for these Castform sprites, but couldn't find them anywhere. As a result, I decided to take a crack at animating them myself. I used the base animation of regular Castform and spliced accordingly. They're set to the same frame rate as all of the other sprites. The Sunny and Rainy formes should be the exact same as the same sprites. The Snow forme was a little more difficult to animate because of those tentacle things. I dunno if the real sprite goes over or under. I presumed over because it looked a lot better when I compared them. So here's my homebrews; they're as spot on as you're going to find on the Internet at this time. Enjoy!