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Hmm... well, to be honest, it sounds to me like it would be less work to cut some strips of cardboard or foamboard (from Dollar Tree) to about 1/3rd the size of your white wall stripe, spray paint the cardboard white, then hot glue it to the center of the white stripe. Then it would create a real 3D effect.

As far as making the walls grimy, I'd add some sand to some modpodge and slather it on. Mix it up in a large bucket, maybe add a bit of water to thin it out a bit, and a bit of brown paint too. Then messily paint the walls. For extra depth, make another bowl of different colored watered down paint - black or olive green maybe, or a darker brown. Then sponge that onto the upper parts of the wall & let it drip down. The first coat doesn't have to be dry to do this - you want it to get all muddied up. I do this kind of technique - random, textured colors & layers - when I age things for Halloween & it works out just fine.
 
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