Searching for "clear phone" or "clear handset" will probably lead you to manufacturer's claims about clarity rather than color. Consider using the term "translucent" in your search.
That being said, take a look at
this item , which is available from a site that specializes in custom phones. Choose semi-transparent blue, semi-transparent pink or clear from the pulldown menu. I also found an old English rotary-dial phone with clear plastics over
here , which is pretty cool too (scroll down about 4/5th of the page).
Here is a closer look.