Having just started in 1:48 scale, I'm working on a diorama to use as a display base for my models as well as for use as background in photos.
I've decided to build a ruin of a monastery, set somewhere in northwestern Europe about 1944. To build the ruin I've chosen to use molds from Hirst Arts, which I think have a great potential. Here's a staircase made from castings from the molds with a 1:48 GI on top.

Here's a test shot of how I imagine the setup of the diorama, with a road to the left to display vehicles and plenty of oppurtunities for displaying figures everywhere:

I added height with expanded polystyrene and tested the layout again:

Then I leveled the terrain with thick plaster:

Then I started to build up the wall, and the next step will be to fill the gaps between the castings:

More will follow...

Additional images can be seen on my new blog, O Scale Model.