"Tsumiki" chalk building blocks by a Japanese company. This is such a cool idea for kids to design there toy with chalk and then redo it over and over again. I bet you could chalkboard paint wooden blocks and DIY.
WoodyMac, Inc. is raising funds for WoodyMac - Magnetic Building Blocks (Canceled) on Kickstarter! Wooden, magnetic, architectural toy - a building block set for boys, girls and fun loving adults. Family-friendly activity for everyone