What did the ancient romans use to decorate the floors and walls of their homes?

They would you mosaics for their floor. Mosaic's are made of tile, glass, or stone and have a picture and/or pattern on them.
On the walls, they would also decorate their walls with murals and paintings. They sometimes even put mosaics on their walls!! 

Hope this helps!

I think they used laurels... ill double check

The answer is d. spain.