A great source to see Earth Hour logos would be their website. I have provided a link in the related links.
See related link
See the related link below.
There is a good image at the link below
You can do that with Crop tool or from Image -> Image Size. See ralated link for good explanation how to do that properly.
See the related link below for an image.
Refer to the link for a image.
A image's link or the website where you found the image.
http://www.fotosearch.com/photos-images/french-franc.html Hope that is good!
http://media.photobucket.com/image/slipknot/kewlaid906/slipknot.jpg
www.fifa.com/worldcup
You can set image as a link by placing HREF into the image tag. It could be done as <img href="#"></img>.
There's a good image of both sides at the link below