I took the paper off another non-singer case. It was like wallpaper on a dried out smaller scale. I think I just used water.

novamontgomery.com is an excellent site to search for anything related to FWs. She has a Topic Index which makes your subject so easy. I think you would like to see it.

I've seen some beauties decoupaged with paper of your choice, but you can decoupage with fabric also
Or how about a newspaper from the FW's year of birth?

got sidetracked, look at this sewing machine phone cover :)
http://www.zazzle.com/vintage_french...57754432890047
do we live in the golden age of sewing or what?

I found this pinterest page when I got a notification that the owner had pinned one of my pictures:
http://www.pinterest.com/tweetsfromcan/sewing-machines/

She has a bunch of "naked" cases also pinned, maybe following the links on the photos will take you to some directions?

Dave MCCallum's featherweight book / video talks about the smell and he uses a light bulb on a stand to kill the mold from the animal glue that holds the case together and the paper on.