I thought Peter Peter was really good !!! Reminds me of 'Whose Line Is It Anyway?' I know that fitting the nursery rhymes to abstract genres can be hard - I just go for the plain ridiculous. Like - Peter/Pumpkins waiting in surgery at Princeton-Plainsboro and House yelling at the interns, " IT'S NOT LUPUS !!! "

I have not read Sherlock Holmes (only Spike Milligan's version, which doesn't count), only watched it on tv, played by the late, great Jeremy Brett and the Robert Downey Jnr one. If I consider 'Mary, Mary' - how about I post a nursery rhyme link and see what inspires you.

http://www.rhymes.org.uk/

:-D