From Muppet Wiki

In March, 2003, McDonald's in Australia offered a set of 10 plush clip-on faces of Sesame Street characters. Each measured approximately 2.5 to 3 inches across, and featured a plastic clip the color of the charaters fur or skin. The theme of the set was "Elmo's Birthday".

Characters included: Elmo, Cookie Monster, Oscar, Ernie, Bert, The Count, Zoe, Grover, Mr. Snuffleupagus and Big Bird.