These were written by 8-year-old kids in a class I used to teach. They are simply syllable-counted  - 1 2 3 4 5 4 3 2 1 - and don't have the extra requirements of so-called "diamante" poems.  You will notice that the line breaks are all in natural places, and don't split phrases.

- - THE RACE - -
          Here
        we are
      on the line
    ready to run.
Starter lifts his gun
    high in the air -
    On your marks…
        Get set…
         Bang!

RUNNING A BATH
           Put
        the plug
      in the hole;
    turn on the tap.
Cold water in first,
   hot water next.
      It's ready.
     Now jump
            in.