1. Begin with a new file, size and color doesn´t matter. Then create a new layer.
2. Now it´s up to you to decide what shape you want and draw out that and apply this settings. Below is the shape I decided to use in this tutorial.
And you are done!
This is what i came up with.
This effects can you apply to your website header. Below is an example on a header i did on my old site.
