Possible Clues:

• Simple poetry pattern
• 'The Purple Cow' rhyme scheme
• Simple poetic pattern
• Common quatrain rhyme scheme
• Like many of Shakespeare's rhymes
• Heroic stanza pattern
• Rhyme scheme for many Shakespearean quatrains
• Rhymester's scheme
• Scheme of Gray’s “Elegy Written in a Country Churchyard”
• Rhyme scheme of Kipling's "If—"