While having a snoop around a local model shop I found these funky (and cheap!) resin trees from Wargames Terrain Workshop. Why not?
A recent 3D Print Kickstarter that I backed (Novus Landing) came with a weird and wonderful collection of aliens, civilians, and, er alien civilians. So to give myself a few more options for table-dressing and spicing up sci-fi games I printed a load of them off.