How is it possible to change the acrobat's background color when someone opens my pdf?
My pdf is produced by XeTeX (using hyperref package).
Take a look of the following picture of two different pdfs. The one on the right (with the "abstract") uses a non-standard background color, while the one on the left doesn't.
EDIT: My question is NOT about changing the background color of pages. It is about changing the standard background color of acrobat reader when someone opens my document (compare grey on the left to light blue on the right)

\pagecolor. See any LaTeX manual.\pagecoloris white in both examples.