Change the color of a window and set the image in the backgound

Hi!

I tried searching for the information on this simple task, but was stunned by scarcity of NSIS documentation about the issue or my inability to find it, for that matter.

How can one accomplish to set a colour that would fill the background of the window (all installer pages) and possibly set a picture on top of that colour (somewhere in the centre of the window perhaps)?

Thank you very much in advance!

Have you tried searching the forum itself? How to set the background color is asked at least once a week in here...