The above two images - and the one below, right - are from the 'Music in Pontypridd' underpass mural. Evan and James James, who wrote the Welsh national anthem, Tom Jones and Stuart Burrows in 'Idomeneo'.
Not really a mural, but I think it is a mosaic, of a sort. The dragon is made from a 'mosaic' of big pieces of scrap marble, set in to the ground. It was exhausting work.