Modifiers matching colors:

• solid,
• dull,
• colorful,
• intermediate,
• special,
• psychedelic,
• simple,
• dark,
• over,
• warm,
• significant,
• positive,
• bright,
• individual,
• related,
• darker,
• muted,
• bold,
• flashy,
• pastel,

Simple categories matching dull:

• object,
• surface,
• color,
• stuff,
• item,
• colors,
• relic,
• material,