Paper Strip Easter Egg Art for Kids Could do this with any shape. Hearts for Valentines, Shamrocks for St. Trees or ornaments for Christmas. Well, you get the idea.
These are really cute - would be easy to construct, too, with folding of circles for motor skills - not sure if they're just patterned paper circles or cupcake cases, but either would be fine.
DIY Animal Tracks book with a link to the printables.----- has a link to Montessori for Everyone, a site that has a lot of free printables for Montessori-type materials.
Arts and Crafts Tree Design. Glue real sticks onto canvas, then glue/modge podge fun things for leaves.