A good answer might be:

No, not that! I meant to say useful and interesting.

Here is my list of things that future gear heads might like to try:

1. Put statements in the print subroutine that alter data in the struct.
2. Write a subroutine that copies data from one struct to another. The subroutine will have two arguments, the address of each struct.
3. Write a subroutine that swaps the values of two structs.
4. Put more fields in the struct and modify all the routines.