The paths are:

RoC
 Ashenvale Dirt: TerrainArt\Ashenvale\Ashen_Dirt.blp
 Ashenvale Grass: TerrainArt\Ashenvale\Ashen_Grass.blp
 Barrens Desert: TerrainArt\Barrens\Barrens_Desert.blp
 Barrens Grass: TerrainArt\Barrens\Barrens_Grass.blp
 Cityscape Dirt: TerrainArt\Cityscape\City_Dirt.blp
 Cityscape Walls: TerrainArt\Cityscape\City_SquareTiles.blp
 Dalaran Dirt: TerrainArt\Dalaran\Dalaran_Dirt.blp
 Dalaran Walls: TerrainArt\Dalaran\Dalaran_SquareTiles.blp
 Dungeon Dirt: TerrainArt\Dungeon\Cave_Dirt.blp
 Dungeon Walls: TerrainArt\Dungeon\Cave_SquareTiles.blp
 Felwood Dirt: TerrainArt\Felwood\Felwood_Dirt.blp
 Felwood Grass: TerrainArt\Felwood\Felwood_Grass.blp
 Lordaeron Fall Dirt: TerrainArt\LordaeronFall\Lordf_Dirt.blp
 Lordaeron Fall Grass: TerainArt\LordaronFall\Lordf_Grass.blp
 Lordaeron Summer Dirt: TerrainArt\LordaeronSummer\Lords_Dirt.blp
 Lordaeron Summer Grass: TerrainArt\LordaeronSummer\Lords_Grass.blp
 Lordaeron Wintrer Dirt: TerrainArt\LordaeronWinter\Lordw_Dirt.blp
 Lordaeron Winter Grass: TerrainArt\LordaeronWinter\Lordw_Grass.blp
 Northrend Dirt: TerrainArt\Northrend\North_Dirt.blp
 Northrend Snow: TerrainArt\Northrend\North_Snow.blp
 Village Dirt: TerrainArt\Village\Village_Dirt.blp
 Village Grass: TerrainArt\Village\Village_Grass.blp
 Village Fall Dirt: TerrainArt\VillageFall\VillageFall_Dirt.blp
 Village Fall Grass: TerrainArt\VillageFall\VillageFall_Grass.blp
 *Underground Dirt: TerrainArt\Dungeon2\GDirt.blp
 *Underground Walls: TerrainArt\Dungeon2\GSquareTiles.blp

TFT
 Black Citadel Dirt: TerrainArt\BLackCitadel\Citadel_Dirt.blp
 Black Citadel Walls: TerrainArt\BlackCitadel\Citadel_SquareTiles.blp
 Dalaran Ruins Dirt: TerrainArt\DalaranRuins\DRuins_Dirt.blp
 Dalaran Ruins Walls: TerrainArt\DalaranRuins\DRuins_SquareTiles.blp
 Icecrown Glacier Snow: TerrainArt\Icecrown\Ice_Snow.blp
 Icecrown Glacier Walls: TerrainArt\Icecrown\Ice_Runebricks.blp
 Outland Dirt: TerainArt\Outland\Outland_Dirt.blp
 Outland ?: TerrainArt\Outland\Outland_?.blp
 Sunken Ruins Dirt: TerrainArt\Ruins\Ruins_Dirt.blp
 Sunken Ruins Walls: TerrainArt\Ruins\Ruins_LargeBricks.blp

*= Odd