About the text: The logo must include the text "Around Brazil in 80 Days", but attempts to somehow include the portuguese version "Volta ao Brasil em 80 Dias" as well, will be very much appreciated.
Other than above I don't have any further strict requirements, so feel free to try anything you want. Just take into account that although the logo is primairly needed for my travel blog, I also might want to print it on a T-shirt. This is why I don't have a real preference towards either a horizontal shaped logo or more square shaped logo.
About the colors: No requirements, but the use of typical Brazilian colors (green, yellow, blue and white) is appreciated. I prefer a white background, because that's most practical, but it's not a requirement.
About the use of images: All text-logos are allowed, but the same holds for the use of images. Using the elements of the Brazilian flag is not considered corny at all, on the contrary, it's appreciated.