Theory:

A cinquain poem is a classic form of poetry. It is a short five-line poem, with a maximum of eleven words. It was invented by an American poet who was inspired by the concept of Haiku. Haiku means a short poem in Japanese language. A collection of 28 cinquain poems, titled Verse, was published in 1915. A striking feature of cinquain poem is the imagery - it is appealing to the senses and connects well to the readers.
Example:
A cinquain poem on flowers:
 
flowers.jpg
Flowers
Colorful, lively
Vibrant and Fragrant
Small buds turn into
Blossoms!
There are some rules to be followed while writing a cinquain poem:
 
1. There should be 5 lines; not less, not more.
2. First line is the title and should be a single word, second line should have 2 words, third line - 3 words, fourth line - 4 words and finally the last line - 1 word. It should be synonymous with the first line/word/title.
3. A total of the above is 1+2+3+4+1 = 11 words in each poem; not more, not less.
Example:
Some cinquain poems:
  
1.
Children
Are unique
Silent, talkative, playful,
Innocent, creative, curious and beautiful
Kids
 
2.
Rain
Brings us
Happiness, joy and thrill
But also makes us
Wet 
 
3.
Tramp
Maybe homeless
Has time for
Little pleasures as he
Wanders