A felted angel-box for hiding treasures.
Marbles from your childhood.
Goodies.
Jewels.
Or:
PS.: I organized an online felt workshop for this Advent season in german language. (I'm planning another one for Spring also in English.) Members get tutorials for 4 X-mas felt projects. The first one was felting an angel-box. If you would like to see some results, let me invite you to the workshop gallery.