This is the "C" flag from the international maritime signal code.
Use a 3x4 rectangle of blue/white duo paper, divided horizontally in 9, and a strip of red paper.
I'm currently working at designing an origami rendition for each flag. The complete collection will be on exhibit at the next MFPP convention in La Rochelle next May.
The models will also be used in an origami for the people installation.
I'm not sure it is allowed to publish the models before the convention. However, after the murders in Copenhagen last night, I think this is an apt tribute.