Step by step method:

Draw your favorite figures on the green cardboard, such as leaves and flowers.

Cut with scissors.

You can add some beautiful hand-painted decorations, which is more perfect.

The size depends on the size of the book.

Then cut a small hole in the upper left corner or upper right corner of the cardboard, and finally tie a knot with a short rope or something through the small hole, and a beautiful cardboard bookmark is completed.