Check out these websites for some ideas for writing your myths!
http://teacher.scholastic.com/writewit/mff/index.htm
http://www.jefftwp.org/middleschool/coreteams/la/greek_mythology.htm
http://teacher.scholastic.com/writewit/mff/index.htm
http://www.jefftwp.org/middleschool/coreteams/la/greek_mythology.htm