Great Illustrator Needed To Create A Website Header

We need a header for our website which shows off our charitable nature. The site is http://www.ddshosting.com. We offer a percentage of our monthly sign up fees to charities and we will be offering a service which plants a tree every month, which we also want to reflect in the header. The design should be laid over the current site design and use the lines of the site creatively. We will need to see the illustration or design in a photoshop file layered over the site. So we can see how it works. It should make the site look fun, professional, creative, green and charitable.