Hey sf

I believe I can help you on this.
I had set up something similar on a site Ive been working on.

additional images module wont work for you unless you only have 6 backround
options

You will need a thumbnail size image for each backround, that will go into the
product descriptions in the admin section along with the "Backrounds" tab

then a seperate html page with the full size image on that page, for the click
for larger image function.

then just link that thumbnail image on the backround tab to the appropriate html page for that backround.

hope I didnt confuse you, but a basic html editor and image program to resize
would be all you need. eg Gimp and notepad


I dont want to step out of line in this thread by going into too much detail
so PM me tommorrow and I can give you a step by step if needed.

just tryin to help, and give something back for the knowledge and help Ive gained
myself from the great folks here.

Thanks Again Zen peeps