These two pics show the beginnings of a project I'm currently working on.  I've got a lot of nice wood pieces that I'm going to have my students use for this very same project, which means I have to do mine first!
Step 1 - drew in my design with a marker
Step 2 - layer on some colored crepe paper with a nice acrylic medium

In case you can't tell from this little cutaways, it's a tree.  I'll show you the entire tree manana.