In general there are a few rules when it comes to pot colour selection that are based around aesthetics in order that your bonsai trees are displayed to their advantage.
Beginner's Guide to Choosing a Bonsai Pot - Bonsai Made Simple
Bonsai pot colour guide
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BEHR PREMIUM PLUS 1 qt. #N340-3 Bonsai Pot Satin Enamel Low Odor Interior Paint & Primer 740004 - The Home Depot
16 Common Bonsai Tree Species to Grow
BEHR Ultra 1 gal. #N340-3 Bonsai Pot Extra Durable Satin Enamel Interior Paint & Primer
Bonsai pots - why they are integral to bonsai aesthetic and health
The Ultimate Guide On Bonsai Display : Stand Out In The Show – Bonsai-En
How to grow and care for an indoor bonsai tree
Bonsai Pots: The Ultimate Guide For Beginners
Tamarack Eastern Larch Tree in Small Nursery Pot. Pre Bonsai or Landscaping - International Society of Hypertension
Selecting a pot for a small trident maple bonsai - Bonsai Tonight