One 6.25 x 6 inch Lil Monster 1st Birthday Street Small Centerpiece. Add some color to your tables with our Lil Monster 1st Birthday Street Small Centerpiece. This centerpiece was designed by Moxzie, Inc. to coordinate with our Sesame Street and Elmo 1st Birthday Party Supplies. The triangular piece is printed on all three sides, and set-up is quick and easy. Use your centerpiece alone, or pair it with our tall centerpieces for a perfect matching set.