Cut paper into 1" strips.
Here are my 12- 1" strips.
Place strips in water. Let them soak for a minute or two.
Take them out of water and gently ring them out.
Gently crinkle them.
Place damp strips in a dryer bag, dry for about 5 to 10 minutes.
Alternatively, you could use a heat tool.
After your strips have dried, take one and fold the end like this.
You can prefold or fold as you go...
Now sew! Sew a stitch right down the middle. When you reach the end of the strip, take another one, fold the end and place it about 1/4" over the end of the first strip and sew together.
Here's how to attach the strips and how to fold as you...
I attached 3 strips together for my ribbons.
Here's my heavenly pile of pleated (and a couple straight stitched) paper ribbons.