National Geographic
Who's up for this challenge?
"NATIONAL GEOGRAPHIC’S 125th Anniversary challenge. Designers, illustrators, photographers and creative people from all over the world are invited to create an original graphic design, eligible to be printed onto a special edition of National Geographic Retail Store T-shirts for the celebration of National Geographic Society’s 125th anniversary."
http://blog.talentsunited.com/national-geographic-125th-anniversary/