todd stahl :: 45 revolutions per minute.: studio in art - value worksheets
Picasso Masks In the Making
Good example of shading. Prompts on side will help middle school kids not overshade.
How to do shadows. CW04 value-shading by JustIRaziel.deviantart.com on @deviantART
Here are value scales for the 12 basic hues: tints
value worksheet 45rpmdesigns.blogspot.com http://45rpmdesigns.blogspot.de/2012/09/studio-in-art-value-worksheets.html
ARTISUN: Value Scales - Student Work
Landscapes in tonal gradation, I would have each student do the same type of landscape for simplicity (city or mountains)
Take a photograph in black and white. Glue it onto bristol board. Have students rip and cut newspaper pieces and place the correct values in the right areas for a collage.
Lessons in Art: Value, Colour and Space.