Books, love the display, you can find similar results using a spice rack (I've geard ikea has a great one for, but It seems there always sold out, see my DIY section for handmade). Also see my printables section for the abc, read cards display in this pic, vintage read cards. Playrooms Ideas, Bookshelves, Book Display, Kids Room, Book Storage, Reading Corner, Book Shelves, Reading Nooks, Baby Room
Also on these boards
Girls’ Room: Acrylic Bookshelves & a Library Wall- cuter shelves but great idea for little books!