Modifiers matching colors:

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

Simple categories matching dull:

• person,
• item,
• stuff,
• robot,
• inventor,
• hero,
• object,
• bureaucrat,
• color,
• reporter,
• pioneer,
• technologist,
• colors,
• material,
• spy,
• relic,
• journalist,
• surface,