Tanner ---
Thanks for the compliment. Modeling Stalingrad is a challenge. I adapted most of the buildings from Ian's website:
http://www.iandrea.co.uk/wargames/6mm/b ... dings.html
Here's the adaptations:
http://www.freewebs.com/gupiao/Building ... 0Ruins.jpg
You also asked about trees. Obviously, there aren't any in the barren landscape above. I have used a couple of different approaches with varying degrees of success.

The ones on the far right were made using the Terrain Maker technique quite some time ago and I'm not entirely happy with the results.

They look too lumpy and need to be re-worked. IMO, sfcgreg29er's trees look much better. Using the same technique for the evergreen trees was more effective.

The 2 on the right were darkened by mixing black paint with Elmer's white glue to stiffen the branches.
I've also bought trees from 2 commercial suppliers, JTT Trees
http://www.jttmicroscale.com/viewcategory.asp?DirID=153 and from a seller on eBay in China.
http://search.ebay.com/_W0QQsassZwehonest_cn JTT Trees are expensive, but they have a incredible variety of tree types available. The Chinese seller is reliable, and it's difficult to beat his price. The 100 count value pack is the best buy. These are his trees.
The problem is the color is too bright for the trees from both suppliers. I haven't quite figured out how to tone them down, but I'm thinking I'll use the darkened white glue to attach ground flocking to the branches. I'll post results as I experiment.
Bill
PS. Hope this helps.