I am setting up a Squeeze+Trinity box to demonstrate to someone with very poor 
sight.  He is also a newbie, which means that everything must be fully 
labeled.  I want to be able to show a light background to the desktop with 
dark/black text under the (enlarged) icons and a dark background with white 
text.  This is something I have done in the past with KDE 3.x, but can't 
remember how.

It is desirable, because many partially sighted people find white on black 
easier to read than black on white.  This chap may not, hence my wanting to 
show him both.

Help, please.

Thanks,
Lisi