Here are some pics of my next plaster brick project. It's a dry stack, which means I haven't glued together any of the bricks as yet. I'm testing the layout and seeing which additional bricks I might need to make.
The Arena is intended for playing this game from the 70's, called Wizard: http://www.boardgamegeek.com/boardgame/3463/wizard
The room has a floor made up of hexagonal tiles. These ones are made by A&K Studios, a fine art outfit that also makes the rune and celtic knot tiles I'm using for the wall decorations. The arch columns at the doorways are from their un-released Moria mould.
The standard bricks are from Hirst Arts.
So, have a look: