The term "blackboard designer" is fairly new to me, but it's not entirely surprising that such creator does exist if you had seen the chalkboards by Pakhuis Oost before. Based in Lyon, France, JM'2 has quite an impressive range of blackboard products, like the sticker blackboards that can be stick to walls, or even furniture, on which you can write with chalk!
Or those wall blackboards with floral shapes? (love!) JM'2's other products include magnetic blackboards, accesories blackboards and decorative stickers. Sounds like a fun collection to me! :)