Why them? I wanted to get more South American countries out so that explains Argentina and Guyana. By the way I love the Guyanese flag. It's just so unique. 

Ghana was one that really should have been in my first group. I had a feeling these colors would look great on the flag and I love what it represents. Ghana was the first African nation to achieve independence. It was also the first (after 19th century Ethiopia) to introduce the symbolic Pan-African colors (red, yellow, green, and black) into African flag designs and became an inspiration of many other African countries. "The black star in the center is the star of African freedom. Red recalls the blood shed by freedom fighters, yellow represents mineral wealth, and green is symbolic of the country's rich forests." - Wikipedia 

To say the least, the Ghanaian flag is very significant and I'm proud to portray it with my designs.