I just re-watched Avatar: the Last Airbender again and, in case you were wondering, it's still the best. Thus, I gained new motivation to complete this coaster idea. I originally sketched these by hand, in order to use the outlines to carve it into clay. I hoped to make these into a ceramic reality, but am delayed due to COVID-19 Lockdown. Still, I plan to make 2 sets; one where the lines are filled in with the specific elemental color and the other set will have lines set in black with the elemental color splatter-painted on.
I used Gravit Designer to make this and spent about 6-8 hours on it. Also, the paper is 8.5"x11", whereas the coasters are each 4" in diameter.