This is a great project for G+T students in fifth and sixth grade. Variations I have done include working individually and letting the students choose anywhere in the world they would like their country to be. The geography and climate of their portion of the earth affects the other aspects, such as history, customs, foods, etc.
Leaving Asia and Middle East behind, it is fascinating to notice how history repeats itself at different latitudes and longitudes, demonstrating once again that nail art is somehow connected to an ancestral human need for beauty and imagination. Incas, Aztec and other pre-Columbian civilisations, in fact, used nail polish to decorate their nails and to define social classes.