A rhyming dictionary and a poet's craft book are two essential tools for creating rhymes. The Complete Rhyming Dictionary, edited by Clement Wood, contains both resources. RhymeZone's search engine is also a quick way to find words that rhyme. Perfect rhymes, internal rhymes and reverse rhymes are simple poetic structures.
The perfect rhyme structure is the most recognizable format for rhyming poetry. It has a typical ABAB perfect-rhyme scheme format. One example of a poem with perfect rhyme structure is: "The carrots in the field/Have been looking very dry/If the crops don't offer a decent yield/The children will surely cry."
In this example, the last word in line one rhymes with the last word in line three and the last word of line two rhymes with the last word in line four: field/yield and dry/cry. These words rhyme because they sound the same. The resulting sound resembles a nursery rhyme.
The internal or middle rhyme is slightly more sophisticated. It is a poem in which the rhyme is placed within a single line of verse. These lines provide an example: "Our eyes avert the field;/this season's yield is sure/To make the children cry/The dry earth offers nothing."
Alliterations, assonances, consonances and half-rhymes have even more complex structures.