Just about everything has a visual element, so anything goes for the sense of sight. Take a walk outside and gather leaves. Make leaf rubbings with the leaves that are collected. Put the paintbrush away and paint with a variety of other objects such as balloons, an ear of corn, sponges, cookie cutters or different fruits. If your preschool allows field trips, check with the local art gallery to see if they offer special tours or workshops for young children.
Bring several textures together and create a texture collage. Supply the children with a variety of materials to make their collage including lace, cloth, rubber bands, crepe paper, tissue paper, string, craft foam and glitter. Construct something fun with foil or play dough. Both items are very different in texture but can be manipulated into a variety of shapes. Provide each child with a piece of foil or a ball of dough and let him shape it however he chooses.
Children can make a garden of smells using four to six different aromatic oils, paper, cotton balls and glue. Cut out flower shapes and glue onto a piece of paper. Dip a small cotton ball or circle of fabric in the oil and glue it to the center of a flower. Have children describe the different smells. Make a giant peppermint by rubbing peppermint extract onto the center of two small white paper plates. Using marker, crayon or paint, children add the peppermint stripes to the bottom sides of each plate. Glue or staple the plates together with the topsides facing each other. Wrap the plates in cellophane, twist the ends and tie with ribbon.
Explore the sense of sound with handmade paper plate shakers, guitars or jingle bell bracelets. After the children have decorated the bottom side of two paper plates, place the plates together with the top side of the plates facing each other. Have an adult staple around the plate's edge leaving an opening on one side. Drop dried beans in and staple to close. To make a guitar, decorate an empty shoe box --- without the lid --- with paint or stickers. Wrap large rubber bands around the decorated box. Attach a ruler to the back of the shoebox leaving about seven inches sticking out for the arm of the guitar. Put together jingle bell bracelets by stringing bells and beads onto elastic bands, pipe cleaners or string. Size the bracelet to the child's wrist and tie.
Make an edible art project by selecting a treat that will encompass a variety of tastes and textures. Make a snowman using three soft large marshmallows for the body, crunchy pretzel sticks for the arms and chewy raisins for the eyes and buttons. Make candy necklaces by stringing different candies with holes in them onto shoe string licorice. Use chewy gummy circles, hard round candies and crunchy circular cereal.