- Siena Cathedral
She-wolf of Siena, surrounded with emblems of confederate cities, dating from 1373. - Siena Cathedral
The Hellespontine Sibyl (detail) by Neroccio di Bartolomeo. She was known for her prediction of Crucifixion. The wolf and the lion represent Siena and Florence. - Classe
My guess would be that the difference in green background also means the border between the original and restored mosaics.