Paint the inner sides of a shoebox with sky blue paint at the top and green paint at the bottom to resemble grass. Allow the paint to dry completely before adding any decor.
Measure the bottom of the shoebox and cut a piece of green paper to fit in the box. Apply glue to the paper and press it securely into the box without adhering it to the box sides.
Cut 2-inch-wide strips of black paper and glue them in a cross in the center of the box's bottom to appear as roads. Paint yellow, dashed lines in the center of the strips for road lines.
Wrap juice boxes in different-colored pieces of paper to appear as high-rise buildings. Cut some juice boxes in half for shorter buildings and place the open section down in the shoebox.
Draw and color different symbols on the juice box papers to align with the community helper theme. For example, draw a red "+" symbol for the doctor's office, an envelope for the post office and a "$" symbol for the bank.
Glue or tape the paper-covered juice boxes in the green paper sections of the bottom of the shoebox around the black roads. Position some standing on end and others on their sides.
Position plastic people, such as a doctor near the hospital, a postal worker near the post office, a crossing guard, a teacher and any other community helpers. When plastic people are not available, make them from paper, color them and adhere them to the inside of the box.