Is there a simple way to substitute one sprite for another?

Without having to re-enter every block of code?

Yes, using the Any (Generic) blocks and lists of components.

Here is an example, using Balls ...

Hello Thomas - do you really want to change the sprite? How about just changing the sprite image?

Hey thanks All - sorry, I thought I had cancelled this post - anyway, I got it figured out

you might want to present your solution then to help others with the same question in future
thank you