This could be done with white fabric painted with black, then lit with green, orange, and finally, blue (as the day progresses) for the forest scene. A Midsummer Nights Dream opera. Jayme Mellema scenic design for The Princeton Festival.
a few moderately sized trees and painted them white with a power sprayer. supported it using cement in a one gallon paint bucket. The windows were hung from one another using airline cable and were arranged in a curve to make the stage appear smaller.