Hello. I have modified htdocs/mysite/views/default/page/walled_garden.php. per Speedysnail6 advise but  I do not get the background image in login screen in walled gardeen setting? Any idea? thank you.

mmmm. I do not know if lack of replies should put me off, but, I try anyways. In addition to above, is there a way to alternate the background image among a few images selected randomly (every time the page is requested or some other interval criteria)?

Thanks in advance for any replies...

Actually Speedysnail6, Team Webgalli and mr.kodok.boy proposed solution worked pretty well. The reason it had not worked earlier because I had made an error in the URL of the background image... Thanks to all!