Stackable Images

Sorry if this has already been suggested, but I'd love to have the ability to stack images in a gallery. This would be useful for when you have multiple copies of the same/similar image but with small changes, or for things like talksprites. My thought for it is, when you click on the image in the gallery, you can scroll down to see all the images in the stack. That way you can still have all variations in the gallery, but you don't have to have them all in a row crowding the gallery. Maybe there could be an icon in the corner of the thumbnail to show that it's a stack.