The Sudbury Cooperative Preschool will hold an art program for toddlers and preschoolers from 9:30 to 11:30 a.m. Tuesday. Children can tackle messy art projects, such as creating watercolor murals using spray bottles with paint, using rice-filled balloons to splatter paint, and making sculptures with gooey clay, as well as play at a colored bubble station. Children are encouraged to bring towels and a change of clothes for the free program. The preschool is at 6 Church St., in Memorial Congregational Church. The rain date is Thursday.