These are really easy to make!
You will need an 11cm square of felt and a couple of brads, or paper fasteners
Cut out the paper pattern for the box. The template is here Tiny box pattern
Pin on the felt and cut out around the solid lines
Fold both of the triangles in to make the box shape
Push a brad through the end of one triangle, then the adjacent triangle and finally through the centre.
Repeat on the other side
You can make these any size you like!