Thank you. The floor is integrally colored concrete. If you're curious about how it was done:

The concrete was integrally colored with no curing compounds and a light
broom finish. Then it was acid etched and sealed with an acrylic
sealer. The integral color was Padre Brown with acid etch colors of
Antique Amber and Faded Terracotta. No water was added. The mottled
effect was achieved by using a rag technique.