Murals sound lovely, but the walls are easiest to maintain the way they are now, and eventually there would be maintenance needed on any murals. Nothing looks sadder than a painted mural past it's prime.... repair is not easy. Most have to be completely redone when it's time and that makes for a bigger project.... sanding, priming and repainting anew.
Visually the tunnels are too close to appreciate a mural and so would be distracting to drive through, in my opinion. (I'm an artist and have painted murals in the past, indoors and outside.)
A subtle pattern in a soft color might be nice, but that too would need maintenance- as concrete absorbs moisture and paint begins to pop off sooner or later.
A bland inside to a tunnel guides your eye to focus on the opening you are headed towards. Might be boring, but I think it's best that way.
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