Purple

Purple: the word which never rhymes
Stands like a vampire behind closed blinds
Avoiding light, lest he be devoured
Like milk and cereal before a shower
Purple: the bane of rhyming verse
Better shut away, like the vampire in his hurst
Whatever word proceeds purple first
Never succeeds in putting an end to verse
With such aptitude as purple's curse
Be it poem, novel, essay, or journal
Purple will never cease to curdle

I think the point the author is trying to make is that no matter the level of skill applied to rhyming the lexis 'purple,' it can't be done. Ironic perhaps.

Essay

Man sits down
To essay write
He'll likely stay up
All through the
Night
For 24 hours, is
Not so long
When 1800 words
Must be Done.

This verse successfully conveys the predicament of a man with much work and little time. The capitalisation of the lexis 'Done' transforms the word from informal verb to abstract proper noun, thus projecting the idea that 'Done' is an important state of being which must be reached within the time constraints of the a single day.