Origami
Origami is often integrated at the elementary level with math. However, it can also be integrated with a wide variety of subjects. Geometry is not a difficult integration. Simply discuss angles, shapes, and other patterns as children follow any of a variety of origami projects. There are thousands of online instructions, including Youtube videos for easy-to-make origami projects. Be sure to research the context and origins, as well as other forms of paper art (e.g. kirigami). A favorite for children is the American Jumping Frog demonstrated here by OrigamiLady: