A Dribble is a 4-line poem with exactly 100 characters (spaces and punctuation not included).
"Invasion" written in Streambed's Ripple, which utilizes a mix of iambic pentameter and tetrameter lines, with a partial refrain in the center of each stanza
Emmett ~ The first line also appears as the first word of every line.
A haiku in which every word begins with the letter C
The Decannelle is one of the easiest forms I have come across thus far.