Create Rainbow Edges for Text and Graphics This tutorial will teach you how to create an effect that can be either bold or subtle depending on your color choices. This is an easy tutorial to follow, so have fun! 1. In Photoshop, select File/New, and create a file 100 pixels wide by 60 pixels high. Using the Rectangular Marquee tool, create a rectangular selection. From the menu bar, Select/Feather with a radius of 1 pixel. Fill this with a pale violet. Then change the foreground color to a red violet, and select Edit/Stroke, with a Width of 6 pixels, and a Location of Outside. The result will look like the image below:
Hey, I know it doesn't look like much yet, but hang in here. A few more strokes and we're done! 2. Set the foreground color to a pale yellow orange, and select Edit/Stroke, with a Width of 3 pixels, and a Location of Outside. Change the foreground color to violet, and select Edit/Stroke, with a Width of 1 pixels, and a Location of Center. Add text if you like, and your result should look like the example below:
You can create a multitude of effects depending on the choices of colors and the widths of the strokes that you apply.
http://www.mccannas.com/pshop4/tip38.htm