For this project, students had to do a value drawing in colored pencil that included at least one realistic tree. That part actually took them the longest, but I can see some major improvement in a lot of their use of value compared to the value cities project I had them do. I think it was a combination of more practice and using the colored pencils instead of the drawing pencils.
Then, students had to draw a leaf and carve it out of a linoblock. I use these SoftKut blocks (I believe that's what they are called...) which I order through Boces.