RE: make background color depend on mode

[Drew Adams]

> I'd like to configure emacs to set the background color 
> depending on the mode.  Is it possible to do this, and how?  

Put a background-changing function on one of the hooks `change-major-mode-hook'
or `after-change-major-mode-hook'. The function can use `set-background-color'
to change the frame background (e.g. as a function of what the mode is).

But keep in mind that background color applies to a frame, not to a buffer or
window (so far), so you will probably also want to use one buffer per frame. If
you do that, you might be interested in library `oneonone.el':
http://www.emacswiki.org/cgi-bin/wiki/OneOnOneEmacs