one thing you could try is tiling the normal map but only tiling the diffuse horizontally, that would give you a degree of detail while allowing nice colour variations
i take it the materials are temporary... could use alot of love if not...to uniform in colour and bump atm also dado rails and skirting are ripe for quick HP action instead of modeling electric lights catch dirt in them add this to the diffuse and emmisive maps and it will look 100 timez betterz garunteed