This is one big reason why I learned calligraphy in the first place - just so I would be able to make cute signs for my kids. Now I am making chalkboard signs for my grandchildren.
I bought this board from Lowe's (can't remember the name). It comes with the black surface that acts like a chalkboard. I have primed some with the overlaying of white chalk all over, then wiping it off; and I have also used them unprimed.
The chalk comes off easily with either a wet cloth or windex. So easy!
Everything is in plain 'ole chalk except for "Lyon" and "the Prince." I used chalk markers for those.