Recursive Pythagorean Tree
This Demonstration recursively generates Pythagoras trees made of selected images. Each square within the tree can be a solid color, an image from Wolfram Language ExampleData or a Spikey. In addition, you can choose the angles of the triangles, the number of levels within the tree and the resolution of each image.
The "angle" slider adjusts the angle closest to the uppermost left corner of the largest square.
There are five image types: TestImage, Texture and AerialImage (from Wolfram Language ExampleData), Spikey and Rainbow.