Possible Clues:

• "Good as gold" et al
• Looks happy picking up current figures of speech
• 'She's Like the Wind' and others
• 'Good as gold' et al
• 'Thick as a Brick' and 'Solid as a Rock,' e.g
• Phrases with 'as a' in the middle
• Rhetorical comparisons
• Fit as a fiddle and tough as nails