She suggested no rules, and that's fair, because the Hebrew psalms are an eclectic lot. Hebrew poems and psalms mostly did not rhyme internally, and even if they did, it would be lost on us, because we read them now in other languages.
The Hebrew poets instead used a variety of other literary techniques. My worship psalm below uses chiasm and parallelism. The parallelism reverses at the pivot point.
It turned into more than an exercise for me; it became an act of worship. I know countless others who have taken pen to paper have had the same experience.
why have you been so merciful and kind to us who are so small.
For our home you crafted a universe beyond understanding;
for our cradle you spun a verdant, moist, warm, life-filled orb.
You filled the planet with peoples of many tongues;
You chose one to be your own and bless the rest.
When the time was right you stepped into time;
You came to help us home through your own Son.
Your fire fell on 120 in an upper room in Jerusalem;
That fire now burns in millions `round the verdant orb.
The end of the ancient cradle of man comes ever more near;
Yet you decreed the days of your faithful ones will never end.
Why have you been so merciful and kind to us who are so small;
How is it, O Lord, that you who are so great, are so gracious to us.