I found these images on my AP Honors Pinterest board. And while, I think Pinterest can be poison at times if you just copy other people's art, I think there are some great art lessons on their.
Take this MACRO view drawing series for example.
Rules for the project:
This is an amazing blog post about why you should draw more in the art room.
Check it out! http://artbybarnett.wordpress.com/2015/06/10/say-yes-to-drawing-tests-in-art/
Art Before Breakfast on Here and Now a service of NPR
I am at teacher with Stokes County Schools.