The island of Djerba is really trying hard to attract non-religious tourists too. Back in 2014, they invited artists from dozens of countries to one of the villages to paint the street walls. Belgrade, check it out if you can :)

But you couldn't just pick any random wall and start creating. First, you had to get permission from the building's residents. While it was tough at first, by the end of the project, people were actually asking for artists to paint on their walls. This whole thing is called Djerbahood.