What were these used for?
These are inlays, they would have been set into surfaces (like on a wall or on a coffin) as decoration.
The falcon head, though, is actually from a piece of jewelry! You can tell because it is rimmed in gold unlike the others.
It's a terminal for a broad collar (there is a big blue broad collar on view at the other end of the gallery). Attached at the bottom, would have been the beads, and above its head would have been the clasp or closure for the necklace.
Thanks!