30-year-old Gavin Williams had spent 15 years in and out of custody, culminating in being incarcerated at HMP Parc in July 2010.
Despite his claims to never having picked up a paintbrush before his time in jail, the Invisible Walls project helped him nurture a talent for art.
His murals became a distinctive feature on the walls of the prison, and after his release, Gavin started his own painting business.
"My eyes have now been opened to the damage coming to places like that do to families" he says.
"Having that guilt has made me more determined to be more successful in my life and not to go back to the same place".
More top news
Parents are more concerned about the cost of sending their children back to school than the price of school holidays, according to research.
The Barclays report calculates regional scores based on gross domestic product, working hours and average house prices.
The case of the “Saturday Night Strangler”, the killer of three teenage girls in the 1970s, will be the subject of ITV Wales’ new series.