We have Charley Harper 123s and love it.
It has some of Harper's iconic birds in it.
Speaking of birds, there's an entire Charley Harper Coloring Book of Birds.
And to help you learn those colors, there's Charley Harper Colors.
You can cover the rest of your learning bases with Charley Harper ABC's.
Like Girard, there's also a Charley Harper Memory Game.
For some giant fun, there's the Charley Harper Ladybug Giant Floor Puzzle.
Or the smaller, but equally fun Charley Harper: Tree of Life Block Puzzle.