Here's a $36\times36$ nonogram with two colours. Name all 12 things depicted in it.
Note that cells filled with different colours do not need to have a gap between them.
Pictured in the nonogram are ...
... the flags of Norway, the United States, Costa Rica, Japan, the Netherlands (or perhaps Luxembourg, given the shade of blue), Iceland, Cuba, France, Switzerland, Russia, the Dominican Republic and Czechia. (The title is a hint at flags.)