Create an image of a vibrant underwater cityscape filled with abstract street art murals on the walls of sunken buildings, where sea creatures swim playfully among the colorful designs.

Envision an underwater cityscape vibrant in its hues and mood. The structures, once on land, now sunken and transformed into an unexpected canvas for abstract street art. The walls of the buildings are no longer grey and cold, but painted with colorful abstract murals, giving the city an unexpected heartbeat underneath the water. Marine life of various shapes, colors and sizes swim jovially through the lanes, among the murals. Their playfulness adds to the unexpected harmony of it all, creating a place that seems to laugh and live beneath the waves.