Add the a subrule called “Mirrors” to the rule “Pigments”

Some pigments are Mirrors of each other:

Red and Blue are Mirrors of each other

Green and Gold are Mirrors of each other

Purple and Pink are Mirrors of each other

Cyan and Orange are Mirrors of each other

Lime and Silver are Mirrors of each other

Black and Brown are Mirrors of each other

Add the following to the list of Tile Actions

Flip: Select a non-white tile with coordinates A,B. Select another tile of the same color whose coordinates are either A+2, B; A, B+2; A+2, B+2; or A+2, B-2. Change the color of the tile in-between the selected tiles to be the mirror of the color of the selected tiles.