This page shows the different variations of the Domek na drzewie from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free. Icons are available in PNG and vector.
This icon represents treehouse. It is a rectangle with a large flat bottom and a square on top. It has a wavy line all the way around the house representing a tree top. The square in the middle has a triangle top and a smaller square inside.