Update - these murals have now been refurbished. You can see them here.
Not much has changed - they are still in a bad way and getting worse. They can be found lining the underpass linking Wallace Place and the Bullring car park in Greenock.
There are twelve Clyde steamers depicted, many have been defaced by graffiti.
Some seem to have had bits gouged out of them.
They are the work of artist Robert Stewart (1924-1995) who was a student at Glasgow School of Art and later taught there as head of the printed textiles department. He also worked for Liberty in London. You can read more about Robert Stewart here. These tiles are very different from his usual style. According to the Tiles and Architectural Ceramics Society entry, the design was screen-printed onto plain white tiles.