Yesterday Sheo. revealed this tutorial for building an excellent microscale tree. It uses only 19 pieces, yet the end result looks amazing:
It looks unstable, but the builder says it can be tipped upside down without any pieces falling off. The natural, round shaping and fine details are incredible at this scale - microscale nature/architecture MOCs will no doubt be enhanced by the presence of a few of these trees, modified to your needs. Here's Sheo's own example, a stately chapel:
The builder shows off a knowledge of nice part uses, including the ski pole, spinning-plate base, and - my favorite - the reversed jumper plates for doors.
Now that you know how to build these trees, your microscale MOCs can be further enhanced...if you use this idea be sure to leave a comment on Sheo's post to let your appreciation be known!