A quick lesson on Haiku's:

Haiku...three unrhymed lines...5-7-5 syllables...describes scenes in nature.
Senryu...same pattern as haiku...not about the natural world, but about human nature.
Tanka...a five line cousin of haiku...2-3-2-3-3
Cinquain...22 syllables...2-4-6-8-2

Here's a few samples:

Words as an art form
the lure of the underground
mystery within
© Aesthete2000


how often, really
can the simple things matter?
always, millions, now
© ahhyeah


Future President
Prefer one with a backbone
Only time will tell
© MotownTerri