Flag of Spain by Gilad Aharoni

Folded from a square of duo origami paper

Flag of Sudan by Gilad Aharoni

Folded from 2 squares of duo origami paper

Flag of Suriname by Gilad Aharoni

Folded from 2 squares of duo origami paper

Flag of Sweden by Gilad Aharoni

Folded from a square of duo origami paper

Flag of Switzerland by Gilad Aharoni

Diagrams in Christmas Origami Book 2010
Folded from a square of origami paper

Flag of Syria by Gilad Aharoni

Folded from 2 squares of origami paper

Flag of Texas by Gilad Aharoni

Folded from 2 squares of origami paper

Flag of Thailand by Gilad Aharoni

Diagrams in Christmas Origami Book 2017

Flag of the Czech Republic by Ondrej E. Cibulka

Diagrams in Origami: Step by Step to Amazing Paper Models by Ondrej E. Cibulka
Folded from 2 squares of origami paper

Flag of the Dominican Republic by Gilad Aharoni

Diagrams in Christmas Origami Book 2013
Folded from 2 squares of origami paper