Origami Bookmark

Bring top right corner to left bottom corner
Crease
Open
Bring too left corner to bottom right
Crease
Open

Bring top left corner to the middle
Crease
Bring bottom right corner to the middle
Crease
Then fold the whole thing in half as shown

Fold both sides of the model down the center crease
Flip over

Slightly open top
Fold the two flaps into the middle

Your bookmark is done and fits snug on corner of any book pages