I see from the Forge World previews for GamesDay 2012 that they are going to be releasing a range of scenery tiles compatible with the Realm of Battle tiles.
In a galaxy beset by war, Imperial architecture is by necessity brutal and fortified. Should the Alien, the Traitor or the Heretic attempt to assault an Imperial world, more often than not it is the great cities of humanity that become battlegrounds; open plazas turning into killing grounds while shattered hab-blocks and ruined Administratum complexes become garrisoned redoubts. The humble tools of civilian infrastructure are transformed into key objectives, with generatorum waypoints becoming vital sources of power and sewer networks being pressed into service as guerrilla highways and concealed ambush points
Forge World scenery designer Blake Spence has been hard at work over the past few months creating four modular Realm of Battle Cityscape tiles. Each is light weight and durable thanks to the hollow resin method we use, and each 2′ x 2′ (610 mm x 610 mm) tile is a blank canvas which is fully compatible with your plastic Citadel scenery.
The Shattered Plaza, Generatorum Sector, Primus Sector and Concourse Sector will each be on sale in limited numbers for the first time at UK Games Day, in advance of their scheduled release.
At £75 each it would mean about £450 for a 6′ x 4′ table which is a fair whack of cash for scenery. I guess you could get away with four (or fewer) if you already have the plastic Realm of Battle. I do like these and are what the original plastic tiles should have been like (in my opinion).