You’ve got old books you don’t read anymore ?
(the tuto of this geometrical folded book is HERE).
No cut, just folds.
One limit : your imagination…
(the tuto of the geometrical folded book n° 2 is HERE).
(the pattern of the heart folded book is HERE).
Altered books can also be useful : here a cards organizer.
Every shape is possible… you can also write !
(the tuto is available HERE)