I couldn't help but notice a lot in common between the Toy Story movies, and The Velveteen Rabbit by Margery Williams.

In specific, the following elements are both major parts of the story:

• They both are about toys who can move and talk to each other.
• The rabbit wants to be real for the same reasons as Buzz Light-year (He can't jump like real rabbits can).
• Toys fear being abandoned, and want to have as much attention as possible

But the most convincing part is when the rabbit is talking with the horse, who had been played with a lot by the boy's father and then passed to the boy.

This part is very much like what Toy Story 2 and 3 is about.

I wonder if any of Toy Story movies were inspired by The Velveteen Rabbit.