Wall paintings from the villa of P. Fannius Synistor in the ancient Roman city of Pompeii. The villa was buried due to ash from the eruption of Mount Vesuvius in 79AD.

Roman, and Greek for that matter, were likely much more colorful than we currently think.  All that white marble we see in the ruins now is just because the centuries washed off all the paint.

The Judgement of Paris. Marble, limestone and glass tesserae, 115–150 AD.

 From the Atrium House triclinium in Antioch-on-the-Orontes (Turkey)