I got this great little recycling art project from A Little Hut blog: http://alittlehut.blogspot.com/2007/05/recycling.html
She has all sorts of great recycling craft projects and many paper craft projects.
Because this project uses x-acto knives, it did it with a Grade 9/10 class that I completely trusted. I always get nervous using x-acto's with students, but I always give a safety tutorial first and so far- knock on wood- I've had no injuries/cuts.
Here's how we did this project:
Cut your junk mail/flyers into a variety of thin strips. We just cut them with scissors.
Look for flyers that have interesting colours. Use a glue stick to glue them on a piece of cardstock.
This is just regular 8 x 11 size.
On cardstock, draw a simple stencil. You need to include a thin border- at least 3cm or so.
Cut it out with an x-acto knife.
And then simply glue it on top of the junk mail strips!
Here are some of the work by my former Grade 9/10 class: