Mosaic ornamentation was widely used in the decoration of houses in Pompeii.
One of highlights is the large mosaic of Alexander at the Battle of Issus, from the House of the Faun. This battle occurred in southern Anatolia, in November 333 BC. The invading troops led by the young Alexander, outnumbered more than 2:1, defeated the army personally led by Darius III of Achaemenid Persia in the second great battle for primacy in Asia. Despite some damage, you can clearly see Alexander on his great horse Bucephalos, and Darius in a chariot.
A common mosaic decoration at the entrance to houses in Pompeii, was the mosaic guard dog. A particularly good example can be seen in the vestibule of the House of the Tragic Poet. The domesticated dog is leashed and chained to the floor and below it are the words “CAVE CANEM”, Beware of the Dog.
Here’s a small mosaic of Pompeii mosaics: