Never buy an envelope again! Wow your friends and bill collectors with mail in these envelopes you've made out of junk. This envelope looks like the sort you'd purchase, with angled bits in the back. Check it out, try it, make someone happy & reduce the landfill all in one fell swoop. And please remember to rate my Instructable. Thanks!
Step 1: Materials Collection
Sources for free and fabulous "junk" paper are everywhere: junk mail, NYT Magazine, gorgeous catalogs for things you can't afford, old calendars, discarded books. Begin collecting as soon as you can because packrat-ism is a positive thing in this case! Whatever you don't use can come in handy for collages and other projects.
Here you see an excellent source for gathering raw materials. For envelopes, you'll want paper at least 8-1/2 x 11", and bigger is better. You will also need scissors and scotch tape. In the final step, you will want a Sharpie pen, or white paper to tape onto your envelope, for addressing purposes.