Custom pattern in gnd plane in KiCad

Hey everyone!

I saw beautiful keyboard, and in my opinion ground plane looks pretty cool with this kind of pattern. I have try to get same result in my design (still empty design but already with cool gnd plane haha), and I accidentally imagined how cool it would be to have a more intresting pattern in keyboard design (or maybe another “stylish hipster” PCB design), so like patterns from kimono or whatever…

So create a more complex gnd plane is possible only with custom footprint?
Maybe someone has experience in this field of design in KiCad?

…Because maybe it would be great to test this, but inside a “sandwich” of acrylic cutted plates, with cool pattern. Anyway it’s another topic but i try to explain as much as possible about my idea just in case.

I would appreciate any help and advices!