Philadelphia mural tour..saw some of the 3000 murals. The walking tour is better exercise, easy to check out the murals up close. The trolley tour covered more murals, and explored North Philly. Many were painted, and somelike the library were mosaic murals.
PhiladelphiaMagicGardens, the mosaics of Isaiah Zagar were incredible. There were mosaic ceilings, walls, floors, bike wheels, wine bottles, and colors everywhere. They even offer two day mosaic mural classes. http://www.philadelphiasmagicgardens.org/