In case you haven't heard me say it enough (and I apologize if you have), I used to be an art teacher. Which meant many long hours in courses like "Teaching Art and Visual Culture" and "Perspectives in Art Education" (to be honest, I'd be flummoxed in explaining the syllabus to you, now 5+ years later).
Obviously I subscribe to a lot of art blogs, which provide a plethora of fun craft ideas and art experiences that I try to incorporate in the daily doings with my son.
One of my beliefs regarding art and young kids is that they should be mostly left to their own devices, to scribble and dabble and explore materials, not be shown how to make a specific landscape and then glue a pre-cut tree or animal on top.
"Every child is an artist. The problem is how to remain an artist once we grow up."