Well, they are 17 syllables in all, three lines long: 1st line=5, 2nd line=7, 3rd line=5
Examples:
Spaghetti is good
It's yummy to my tummy
It's nutritious too
That is more like a grade school poem. Here are more advanced ones:
Beauty reigns today
Showers of water and luck
Dive into fountain
You're eyes twinkle blue
Like the beautiful ocean
I will follow them
Autumn's leaves are here
Freezing winter follows near
Sun's out, moon is gone
Without you I sleep
My life is dark and lonely
Need to be with you
Graceful waves greet me
Blue waters splash me
So clear I can see
Exquisite colors
Wings of burnt orange and black
Butterflies flutter
I hope you get the point. Hope this helps!