I like the new tiny trees. I can finally replace the ugly stumps in my house and GH with some real trees.
The chimney is great. Originally I thought of making a homemade chimney out of a blue barrel and a grill layered under it to give that smoke effect. I have a gorgeous fireplace in my house, so now I have a worthy chimney above to emphasize it.
I'm currently using railroad tracks to give the illusion of a second floor into the living room. It'll be much nicer once I get the actual staircases in there.