For proper operation, check that the units of measurement in the scene are in mm:
Customize - Units setup - System unit setup - mm
The carpet material is made using the Displacement card (make sure that Displacement is enabled in your scene settings).

3 carpet sizes in the scene, 6 colors:

- 50*80 cm.
- 70*120 cm.
- 120*170 cm.

https://www.benuta.eu/bath-rug-nia-cream-60007809-62101.html?url_key=bath-rug-nia-dark-grey-60007809-79101 

More carpets: http://3dsky.org/collection/shared/5321350