Hope I don't kill your thread stone dead, Helen, but the scope's pretty wide. I got to 60 sayings pretty quickly before deciding to try a Google search for a list. It took me to the excellent Phrase Finder site, where I found more than 400 body-part-related phrases using the query (anyone who wants to keep playing don't click on this link!):
http://www.shu.ac.uk/cgi-bin/tp_post2.cgi?w=body
(although at least 10 of mine weren't on the list.)

For anyone wanting general phrase searches in the future, just use:
http://www.shu.ac.uk/web-admin/phrases/

p.s. added later - eg try "rat"