What are some cheap, clean at home crafts I can do with my children?

Stickers ar a big hit with my four-year-old. You can get them inespensively at dollar stores. We also buy cards, cut out the pictures from the front, and make collages. Playdough is always fun, and you can make your own. Bake and decorate cookies. Make God's eyes--ojos de Dios--by gluing two Popsicle sticks together to make an even cross, then wrapping yarn of different colors over and under, over and under, to make a sort of three-dimensional diamond. Google it if that doesn't make sense. Watercolors are fun and they don't cost much. You can print coloring pages, mazes, and ornament patterns from the Internet. Plastic self-stick gems are fun. In the summer, pick flowers and glue them to cardboard. Have fun!