Our friends at Charles and Hudson have put up a great tutorial to make your own wooden growth chart. We've seen many over the last several years, but this one, depending on what you have at home, may be 100% free.
Wood that was already on hand was stained with leftover coffee grounds that had been sitting in water. It acts as a stain and is a great eco friendly alternative. Their finished product looks great and is easy for you to make too. Check out the full tutorial at Charles and Hudson to make your own.
(Image: Charles and Hudson)