As a friend asked me to create a business card for here she wanted a stamp-like (German: Stempel) effect for her logo.

By applying the following technique I got this result.

1. Create your Rounded Rectangle (15px radius)
2. By entering the layer's Blending Options, change the Stroke size, e.g. 8, its Position, e.g. Inside and its Color to a one being typical for stamps, e.g. #8995C3
3. Then, change the layer's Fill Opacity (interior opacity) to 0% so that you only see the border (Stroke) you just added
   
4. Now the magic happens: Set the layer's Blending Mode to Dissolve and change the layer's Master Opacity to let's say 70%

Your stamp's frame is done!

If you want, you can add some text in it and apply the same Dissolve technique. To be more legibile you should use a higher Master Opacity, e.g. 90%.

Do you use different techniques? I would love to hear them. Tell me in the comments, please.

Regards, Alex