I was wondering if the Qt widget used for body text has a provision for background images?
QTextEdit#richTextEdit { background-image: url('/home/tbrown/Desktop/cow2.jpg'); }
in the stylesheet gives the effect attached (i.e. it works).
If you wanted node specific backgrounds Leo would have to start setting
an attribute on the body widget, probably the gnx, so you could do
QTextEdit#richTextEdit[leo_gnx='tbrown.20130430222443.19340'] {
background-image: url('/home/tbrown/Desktop/cow2.jpg');
}