DIY Easy Chalkboard Play Mat or Table Runner Tutorial from Studio DIY here. For grownups or kids. They have a link to Amazon for chalkboard contact paper in a roll of 18” x 6’ for around $8 and over 100 4 and 5 star reviews.
DIY Kandinsky Inspired Lid Art for Kids from Or Die Trying here. These are the type of craft projects I did as a kid. Love this. First seen at recyclart here.