Seamlessly tiled, scrolling, animated backgrounds

[melody]

What about making a pattern like the Kirby one? I guess something like that could be done via trial and error. The way I'm doing it now, because I'm not sure how to make a pattern like that, is to create a giant block of text, and shrink the canvas down without actually shrinking the image. Then, I have extra space to reposition the image during the animation step, and it seems to work. But I feel like my approach is hare-brained.