If you have a bunch of plain envelopes at home and don't want to spend a ton of money on fancy ones, try decorating them ...

And some of them actually do a good job of obscuring the contents inside, even if you hold the envelope up to the light. But have you ever taken the time to appreciate the beauty of security ...

Insert confidential correspondence into a plain envelope (free of any previous markings) and seal. Mark the envelope "Personal and Confidential" or "To be Opened by Addressee Only." Insert this ...