Originally I was thinking about a Toy Story alphabet but there were still quite a few blanks. Expanding to include the entire Pixar collection was very helpful, though I did have to cut a few key players to try to keep somewhat of a balance between the films (sorry Woody, Mike Wazowski and Marlin).
Depicted are: Anton Ego (Ratatouille), Buzz Lightyear (Toy Story), Carl Fredrickson (Up), Dory (Finding Nemo), Eve (WALL-E), Flik (A Bug's Life), Geri (Geri's Game short), Hamm (Toy Story), Mr. Incredible, aka Bob Parr (The Incredibles), Jessie (Toy Story), Kevin (Up), Lightning McQueen (Cars), Mater (Cars), Nemo (Finding Nemo), Omnidroid (The Incredibles), Princess Merida (Brave), Queen Ant (A Bug's Life), Remy (Ratatouille), Sulley (Monsters, Inc.), Tinny (Tin Toy short), Underminer (The Incredibles), Violet (The Incredibles), WALL-E (WALL-E), XR (Buzz Lightyear of Star Command), Yeti (Monsters, Inc.) and Emperor Zurg (Toy Story)
Prints, shirts, stickers, skins, iPhone cases and more are available at http://society6.com/mbaboon/P-is-for-Pixar-Pixar-Alphabet_Print or http://www.redbubble.com/people/mbaboon/works/9042761-pixar-alphabet. Society6 tends to have better pricing depending on your location, but Redbubble has more options (like kid-size shirts).