I did this in Nova Scotia in June 2016. I wrote "own a beach house on the Florida gulf coast". The chalkboard is erased every morning so everyone gets a chance to write on it. LOVE the idea and actually writing on it.
If you're a Whovian, you HAVE to check out this Doctor Who Inspired Gallifreyan Pendant. Transcribe your own phrase into the fictional language of the Time Lords, and write out the circular script for your design.