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method:creating from a rectangle

1. Cut a rectangle from the poster board, it can be any size but not larger than 2*2 inches for the tessellation.

2.Draw a simple line from one side of the rectangle to the opposite side.

3. Using the line drawn, cut it and then interchange the two pieces and tape them together.

4. Draw a perpendicular line to the first one on the resulting figure

5. Using the line drawn, cut it and then interchange the two pieces and tape them together. 6. The resulting shape will tessellate the plane.
Please let me know if you need any clarification. I'm always happy to answer your questions.