Need Different background image for some Pages

I am trying to add a background image to my PAGES – certain ones, at least. Is there a simple way of doing this maybe through the HTML of the page code itself without mucking around with CSS coding of the Weaver theme? I just want a background other than the stark white for some of my pages, and need to be able to select, preferrably, an option to add a different background image (texture).

This was easy when i was designing my own pages on my site, using a WYSIWYG editor, and inserting background image in the code, but now, I’m migrating and combining my blog and author sites using the Weaver II theme, and i need some pages to have a particular image as background for that content.
Thanks for any insight.