Sure, but what is the point of that? It's not as if I would remember all the different images. And it checks with the previous one, so what's the purpose (genuinely asking, as it looks pretty cool).
The idea is that you may not "remember" it but you'd subconsciously notice if the image was different. I'm not sure it's any better than a hex key in that regard - either way people usually just go "yes" the first time they connect - but I can imagine it might be easier for some people to notice.