Harry Potter by J. K. Rowling.
Focusing on Luna, Hermione and Hagrid.
Luna would forego wands and draw up beautiful designs by hand, magicing them on her friends skin for a couple of days.
I think both Luna and Hermione might sport something like this, a token from the muggle or wizarding world, a reminder when they're away. Also, coin necklaces are the most wonderful thing ever, so there's that.
Only Luna's own Raddish earrings look more resolutely Luna than these- I can actually visualise her wearing these. They're perfect.
Well if Hermione didn't have something like this, I don't think I know her at all.
Going back to my previous comment on Luna and her art, she would no doubt become a bestselling childrens author, who releases her own line of colouring books of magical creatures, somewhat like this. Original editions for her friends children.
When they go to visit Luna, this would be there, on her wall.
A reminder and a way to... innocently keep the polyjuice potion recipe close at hand, for Hermione.
I'm very fond of the budding career as an artist I see Luna taking on.
A beautiful gift from Hagrid!
Magical hairpieces for Luna, who will wear them with all the fearlessness she doesn't even realise she has.
This is one of the most perfect things I can see Hagrid giving to one of Ginny and Harry's children- they would become terrified, because of course they'd assume it was a real dragon, the children would be estatic either way.
And the thing everyone remembers.