Recycled sketch/note books are SO easy, handy and effective! Simply find a selection of papers and cardboards from wherever you can. They might be crumpled bits of scrap, the front of some packaging, the end of a drawing pad, lined, squared, plain, greaseproof, old new or unwanted.
Cut or tear the pages to size. Or..keep them different sizes..it does add to the fun of it.
Use a hole punch to punch holes in every sheet.
Use string, wool, ribbon or raffia to tie the pages together through the holes.
Decorate at will!