A councillor has asked for graffiti on the walls of an underpass not to be removed as he says it brightens it up.
Graffiti artists face £80 on-the-spot fines if caught
Spray painted murals are appearing in the subway under the Carmarthen east bypass used by people walking to town.
Alun West said the drawings were not offensive but colourful and had taken a lot of time to complete. He said people had commented on how good they looked.
Carmarthenshire Council said the graffiti was illegal but would not be removed if there were no complaints.
Local authorities in Wales and England have the power to issue £80 on-the-spot fines to people caught spraying graffiti.
Two years ago two young men in Manchester were sentenced to 10 months' youth detention for spraying their signatures, or "tags", onto trains and bridges.
During the past month five pieces of graffiti ranging in size and colour have appeared in the underpass and sketches on the walls suggest more may follow.
Llangunnor community councillor Mr West said he did not think they were causing a problem as they could not be seen from the road.
"I walk my dog along here every morning and sometimes again in the evening and I've spoken to a few people who say it looks quite nice.
"I don't understand what it says but it is not offensive as far as I know and whoever did it must have been working through the nights because they are big.
"A few months ago someone did two of The Simpsons nearby and they were very good but they have been washed off."
Carmarthenshire council's environment officer Paul Morris said for the time being the graffiti could remain.
"While the council does not condone graffiti, and by definition it is a criminal offence, common sense does prevail," he said.
"If the community thinks the graffiti enhances the area we would have no objection to leaving it there."