Narnia contains a huge number of fantasy characters: talking animals, fauns, centaurs and characters unique to Lewis, like marshwiggles. Ask your children to pick a favorite character from the books and write or draw a story about them -- something that takes place in their lives beyond the scope of the books. If you have puppets or stuffed animals that resemble the characters, let kids put on a puppet show relating the story.
A diorama is a miniature scene placed in an empty box. Have the kids build their own dioramas depicting a favorite scene from one of the Narnia books. Have the children draw and color separate images of the characters in the scene -- Aslan, Edmund, Lucy or others - as well as any props that might appear, such as trees or the Stone Table from "The Lion, The Witch and the Wardrobe." Have them add small tabs at the bottom of every image: little squares that extend from the bottom of the images. The children cut the images out, then turn the box on its side and glue the cut-outs in place using the tabs. The result is a scene from the books brought to life.
If you are of a fashionable mind, create or find costume materials based on characters from the books. Old clothes shops likely contain pieces for period outfits for the Narnia children's characters, along with fake fur coats for their journey through the wardrobe, and animal costumes stand in for characters like Aslan and the beavers. If you are feeling villainous, find a white formal dress and a tinsel crown for the White Witch. If money or time is a factor, have the kids make paper masks of Narnia characters. Give them each a sheet of paper big enough to cover their faces, then have them draw their favorite character's face looking straight head. Cut out holes corresponding to your child's eyes and mouth, and two small holes near the ears. Cut out the mask itself. Run a length of string through the two holes near the ears and fit it around your child's head.
Turkish delight is a confection that plays a key role in "The Lion, The Witch and the Wardrobe." The White Witch uses it to seduce Edmund Pevensie into revealing important secrets. Turkish delight involves multiple steps, but children can help with some stages of it. Plan a cooking day where you and your kids create some Turkish delight in the kitchen. Find recipes in many cookbooks, as well as online sites such as World Recipes (Resources).