From the Make blog comes this fabulous idea for those of us who like the idea of blackboards without necessarily wanting to cover an entire wall with black paint. All you need to get started is a used classroom globe, spackle and sandpaper (for creating a smooth surface), and a small can of chalkboard paint.
What we love about this idea are its countless creative and practical applications. You could use colored chalks and decorate the entire globe with a beautiful floral motif. You could draw the continents and illustrate them with their native animals. You could pretend that the globe is the moon or Mars and indicate where their geological features are. (Where exactly is the Sea of Tranquility, anyway? Maybe now's the time to finally get to the bottom of that.) You could even do some worldbuilding and invent your own planet.