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I created this little pro-recycling image from the interior of envelopes I received in the mail. I love using patterns in my art. The eyes of the owl are made from tiny little recycling symbols. I used a leaf punch for the three leaves, but the rest of the pieces were cut or torn by hand.
I ran a google search on envelope security patterns, only to find a wonderful collection: The Joseph King Collection - currently numbering 139 from around the world!
And some craft ideas for reusing the envelopes:
Make Modern Paper Beads from Security Envelopes
Ooh, and here's a blog post showing a whole bunch of projects using the envelope patterns! Wonderful stuff!