The Earth and Water registers of the "west front" of kavad 4.6. It’s pretty clear that each of the objects are going to have to be painted in some sort of color scheme, rather than merely left blank with the background of their sign.
I also think that I’m going to have to vary the color scheme a bit — bright hue for the Cardinal sign, middle hue for the Fixed sign, and dark hue for the Mutable sign, in order to distinguish them. It may also be worthwhile to reorganize the grid of the zodiac overall, so that each column or row also represents a season of the year. Then the roundels between them could be markers or indicators of specific feasts and festivals between them.