Kinda, maybe.

There's an eMac disassembly guide out there with some pics of clear case parts from eMac. Its in japanese so you'll need a translator (Babel Fish works well enough)

http://suyama.co.jp/index.html

OTOH that came out weeks after the eMac did. Depending on how old the eMac is there might be a possibility, but I doubt it. Apple probably moved those to solid plastics before they converted the ibooks. Of course, you could always hit it with a regular paint job and a clear coat...