There is no equivalent of Gregorian chant in the realm of art:
The Church has not adopted any particular style of art as her very own; she has admitted styles from every period according to the natural talents and circumstances of peoples, and the needs of the various rites. Thus, in the course of the centuries, she has brought into being a treasury of art which must be very carefully preserved. The art of our own days, coming from every race and region, shall also be given free scope in the Church, provided that it adorns the sacred buildings and holy rites with due reverence and honor; thereby it is enabled to contribute its own voice to that wonderful chorus of praise in honor of the Catholic faith sung by great (persons) in times gone by.
Nevertheless the development of sacred art from the various cultures of Europe and the world are all determined to be “treasures.” Even modern art is “given free scope,” provided it satisfies a basic positive contribution to architecture and liturgy.