This is one of the neatest patches I've seen. It was was created by Justa Maniac with Adelaide Roller Derby to celebrate their officiating crew's travels in 2013. The blue is a map of Australia, with the star being their home city. The colored lines emanating from the star represent their travels around the country to various derby events. The busy black area in the Southeast is the city of Canberra where the 2013 Skate-Turion tournament was held.