The tunnels do evoke a little Beauty and the Beast dichotomy; lovely drive in the sun amidst the pretty landscaping, then boom! Subterranean! Sulphurous! Murky!
Would faux painting work instead of murals? The outside walls of the golf cart bridge over 27 is an example. I know nothing about it, but don't imagine that needs to be touched up much since it's intended to be aged looking.
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