I'm totally collecting them.
Its called Miffie in other countries, if I'm not mistaking.
The bruna (a dutch bookstore) is giving them away again. There called "Wens Nijntjes" or "Geluks Nijntjes" (or in English that would be Wish Miffies and Luck Miffies).
As you can see I have attached them at my mobile phone. Aren't they adorable???
Its a thing that makes me happy at the moment :D