I've had several requests since posting the Postage Stamp lesson for a follow-up on how to create the envelope used in that tutorial. Well today my Photoshop friends your prayers have been answered. Here's the step by step to creating that cool old envelope.
In this Adobe Photoshop tutorial, you will learn how to make an icon of an envelope, you can use this tutorial to make your own email icon, or what ever you like, I hope you enjoy this Photoshop tutorial.
Step6: Creating the letter inside the envelope. Create a new layer, Layer New Layer... (Shift+Ctrl+N). Make sure this layer is behind the envelope layer. I created a yellow paper using this color #e7e180, Using the Rectangle Tool create the effect of the paper shown below.