exanimation doesn't actually reference tiles or rgb values when animating; instead, it references an address in ram to load data from (similarly, the destination actually gets converted to the vram address rather going anywhere in ram). the only exception is when animating a single color, in which case it uses direct SNES RGB values.

normally, exanimation doesn't output anything into ram. but if you use a palette + working option, it mirrors color data into the tables at $0701/$903. you can then point other exanimations at that data to use it as their source

by chaining several exanimations together I got a constantly increasing value into the palette data, which i then used another exanimation to display the large block you see