How to change color and image on SAP GUI screen dynamically?

We have a reporting database that gets refreshed daily.

To identify that some one is in the right place, it is proposed to change the Color and Image on the SAP GUI screen.

How to restore the color and image after the nightly refresh - without human intervention?

For image, probably a batch job can be scheduled?

For color - I am not sure how to address this..

Please advise with suggestions..

Thanks,