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Heather Shida, who's been making origami since the age ... You'll now have something resembling an envelope. To insert a letter, remove the paper out of the tabs, insert and refold.

5. Take the sides of the folded sheet and make two equally sized flaps. (These will be the sides of your envelope.) 6. Dog-ear each corner and tape down. 7. Fold the bottom of your sheet up so it ...

Craftbits has step-by-step instructions on how to fold an envelope out of a standard sheet of paper, including how to make an envelope pattern so you can whip up several of these bad boys at once.