To me, natural can mean free, and there is a site that offer both free and paid pixel advertising, a link to which you can find at the bottom of this post. This is probably in response to Alex Tew's immensely successful Million Dollar Homepage. Anyway, free unfortunately means I am limited to 60x20 pixels which means I am forced to shorten my blog title to "Natural". I also used the free button generator, the link to which, again, you will find at the bottom of this post. They are conditions for using their free service.