Some cool image websites images:
Ghana Grunge Flag
Image by Free Grunge Textures - www.freestock.ca
Grunge textured flag of Ghana on vintage paper
EDIT 4/22/2013: This grunge flag is now released under a standard Creative Commons License - Attribution 3.0 Unported. It gives you a lot of freedom to use my work commercially as long as you credit and link back to the same free image from my website, www.freestock.ca
