Rhyming poems are lots of fun, but in fact are extremely difficult to write well. You need a good sense of rhythm, and know how to rhyme without it disrupting the poem you are trying to write.

A good start is to write a four line poem in which only the second and fourth lines rhyme. Choose a subject (it certainly doesn't have to be humorous) and think about what you want to the poem to say. Poems with short lines do lend themselves to humour, and longer lines allow you to sound more serious. If your rhymes are not working, or your rhythm is clunky, try a different pair of rhyming words.

The best thing you can do is to read good rhyming poems and listen to the rhythm and think about the rhyming words. Doug has used desk and grotesque to start with - his rhymes are suprising, and it adds to the fun!