handmade paper, glue, double sided tape, wool
Take the measurements of the outside of the binder + 1.5 cm extra.
Cut it out, take into account the back of the binder. leave here some space for opening and closing of the binder, use the double sided tape and fold the 1.5 cm inwards.
Take the measurements on the inside and stick the paper on to the paper that was folded inside.
For decoration: use some handmade paper in a different colour on the front and a ribon or a string of wool (see pictures)