Colors have very specific signficance. Originally, it was thought colors always or generally reflected the mood of the spirit, but this appears to not always be the case. This is very deceptive, because they are literally inter-diminsional and perspective can be easily misread. Bear in mind, that their size DOES NOT relate in proportion to objects in our world which they appear in proximity to. As varied as it was in life.
Many Colonial spirits are quite playful and rowdy.
Many Native American spirits are somber, often leaning towards being unfriendly. Many 20th Century spirits are distant, uninterested, self-absorbed, not very interactive.