This tutorial is directed towards beginners and thus will go into significant detail on how to accomplish each step. This tutorial was made specifically for Gimp 2.6.4.
In this tutorial I will show you how to create this image from scratch:
We will use several techniques including some filters and these tools:
In case at any point you have trouble finding any of the Dialogs that I refer to in the tutorial, you can find all of them by accessing this menu:
First create a new image. I made mine 500x647px at 300ppi. Next create a new transparent layer. Use the Paths Tool and create a simple path: