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
The partner of a 43-year-old mother whose body was found after a major police search has today denied her murder.
Catch up on the latest episode of Coast & Country. This time, we're celebrating all things made in Wales!
Public Health Wales is launching the programme after new survey reveals many parents don't realise their child is overweight.