So much fun! Karen Eckmeier taught her accidental landscapes class at my guild recently, and I made this.
Karen's technique is really fun and improvisational. You can control what your landscape will end up looking like, but you can also just play around until something serendipitous happens -- or do any combination in between. Karen also has a clever way to make a wavy inner border, which you can see on my friend Mary's blog, Comfy Quilts and A Good Book.