I want something very subtle: a birthday hat over a letter and the "8 years" would do it. Maybe a cake but again, very subtle (The logo must remain as the main element). We run our site in english/spanish so there must be 2 images. The translation of "8 years!" in spanish is "8 años!".
We are going to use the image in the header of our site, so I would like to keep the height of the logo (you can shrink it a little). Remember, the logo must remain the main element.