Have fun teaching your toddler the names of some common shapes such as circle, square, oval, rectangle and triangle. Brighten it up by cutting out different colors of cloth or paper. Let your child handle the shapes. Using pieces of flannel is suggested because they will, of course, last longer than paper.
Take a look here to find many more toddler-appropriate activities to reinforce your child's learning in fun ways.
The Alachua County Library District has many books to check out for learning about shapes.
Animal Shapes by Neal
Mouse Shapes by Walsh
Baby Sees Shapes: Circles by Kashiwar
Shapes, Shapes, Shapes by Hoban
Shapes by Cabrera
Bulldozer's Shapes by Rinker
Corduroy's Shapes by Scott