- Volta pinta
This loggia in Piazza del Comune was painted in 1556, probably by Raffaello Coda da Rimini. - Chiesa di Sant'Andrea
Frescoes on one of the columns. - Collegiata di Santa Maria Assunta
Old Testament by Bartolo di Fredi (~1360). - Collegiata di Santa Maria Assunta
New Testament by Barna da Siena and/or Lippo Memmi (~1345). - Palazzo Vecchio
Officially, such decorations are called grotesque. - Palazzo Vecchio
Grotesque or not, I like them a lot.