This design is based off of Jennifer F's video "Greek Paper Football".
I used regular cereal box cardboard, which is something like .25mm thick...
Step 1: Make the strips
Cereal Box Cardboard (or any thin cardboard, I suppose. You could probably also use thick paper, or thin plastic)
Paper Cutter (optional)
Cut six (6) 20cm x 1.1cm strips
which is about 7 7/8 x 3/8 in
Step 2: Bottom Half
Step 3: Top Half
A few tips:
When in doubt, make sure the strip alternates over and under
Keep the pentagons tight, and make sure the sides of each all go in the same direction.
The video's probably more help than the pictures :D
Step 4: Finishing Touches
Now you can make some more to juggle with, or play hacky sack with, or just throw at the people nearest you.