Redo buildable floor materials to match retro image set.

COPYING.rtro

@@ -96,6 +96,9 @@ tanbench, workbench: Derived from table_4, of unknown licensing.
 rl_house2: Referenced from classic image rl_house2, of unknown licensing.
 ench_armour, improve_*, prepare_weapon: Derived from retro spell scroll, of unknown licensing.
 mb_lavawell: Referenced from retro lava well, which is derived from retro well. License unknown.
+mbgreenmarble, mblightmagentamarble, mbmarble, mbpinkmarble: Derived from their respective marble images, all of which are derived from the white marble image. License unknown.
+mbwoodfloor, mbwoodfloor2: Derived from their respective woodfloor images. License unknown.
+mbblackmarble: Derived from retro black marble image. License unknown.
 
 Original images with known licenses:
 jade_coin: Created by SilverNexus. Licensed as CC-0.

ChangeLog.rtro

@@ -1,6 +1,16 @@
 ------------------------
 Changes for top of trunk
 ------------------------
+2023-08-14 Daniel Hawkins
+	* mapbuilding/mbblackmarble.rtro.111.png,
+	  mapbuilding/mbgreenmarble.rtro.111.png,
+	  mapbuilding/mblightmagentamarble.rtro.111.png,
+	  mapbuilding/mbmarble.rtro.111.png,
+	  mapbuilding/mbpinkmarble.rtro.111.png,
+	  mapbuilding/mbwoodfloor.rtro.111.png,
+	  mapbuilding/mbwoodlfor2.rtro.111.png: Replace art with new versions to look like they place
+	    their retro image counterparts, rather than base.
+
 2023-08-13 Daniel Hawkins
 	* player/race/troll_p.rtro.1*.png: Replace downscaled base images with XPMs from 1.0.0.
 	    Some rearranging was required to match the additional animation frame for each direction.