I'm usually not that big on the whole 'natural play spaces' thing because most of them look too much like workout equipment and don't have much room for imaginative play- but this one actually looks great!
DIY Play Table for the Playroom Lake Lake Cowan - I saw your pin for the cute coffee table turned chalkboard kid table. But I thought these little chairs super cute and so much easier than the DIY ones on your pin. Not the table - just the chairs!
Wall mounted ball run. This would be great for kids who are too young for the marble runs. Could be used as a music installation if there are movable obstructions in the pipe that make sound when a ball touches them