Howls Moving Castle by Diana Wynne Jones.
Focusing on Calcifer, Sophie and Howl.
I can absolutely see Howl magicing this up for Sophie.
And this, a more personalised gift, though I think Sophie would never let Howl catch her wearing it.
A picture of their cottage in Wales, where they keep all manner of wonderous creatures.
A ring of promise.
Perfect for Sophie, or Howl, to keep a little magic on hand at all times- ready to be cracked open in an instant.
Wouldn't it be excellent if someone in the castle chose to get a little cat as a kind of lucky charm? Perhaps only a toy one, but...
Calcifer, I anticipate, would have made gifts for each of his friends at some point, all with a little bit of him on or in them.
Obviously they would have a castle in Wales in addition to the cottage.
When in Wales, a mask must be worn for Halloween. This would be Perfect!
Bought by Sophie for Howl. Howl would, of course, put it outside their room.