I've played around with "create an image based on this image" chains quite a lot, and yep, everything goes brown with 4o. You append the images to each other as

I've played around with "create an image based on this image" chains quite a lot, and yep, everything goes brown with 4o. You append the images to each other as a filmstrip and it's almost like a gradient. They also simplify over the generations (eg a basket full of stuff slowly loses the stuff), but I guess that's to be expected.