Structures which could be used on a layout ?

I got them today ; the buildings are REALLY small in comparison with Faller or Kibri (some doors are 6.5mm in height), they are rather suited for backgrounds. And the trunks of the trees are made of bare twisted piano wire, like some german fir trees in "kits" in N-scale in the 80's (Busch), it would perhaps be better to cover them with a piece of shrink tube or, even better, paint them brown ...