Groups of short words also work: For sevens, try Jack and Jill went up a hill, or Lift up your heads O ye gates; for sixes: My cup runneth over or Jonathan Appleseed; for fives; Ave Maria, rain in the city, gratia plena,Philadelphia- rhythmic phrases abound in poetry and you could be influencing your spiritual side whilst playing, if you wish.
I also have used hippopotamus. For seven I remember using alligatorcrocodile and paralegalassistant, and of course, in his music, carlosalzedo is perfect for five.
I have also created a verbal solfege for saying pedals out loud for every position.