I am not a mathematician but I am an artist and fractal enthusiast who spends lots of time creating art using this geometry. I recently discovered online you can make fractals in MS Paint (there's plenty of info online about this) and one of the first fractals I created was the Viscek fractal. First I did the cross form, then the saltire form, but then I had an idea: why not combine the two? So first I start with a square, then add a square to each side like you do with the cross form. Next, I duplicate this new cross shape and add it to the corners of the cross, creating somewhat of a tile pattern.
I repeated this for an unknown amount of iterations until I eventually ended up with a stunning final result.
Surely a shape this simple must have been discovered before, right? I doubt an amateur like me was the first one to think of this. Either way, I still think it's neat I came up with it on my own even if I wasn't the first.

