If you go to http://colorschemedesigner.com/ and hit "Random > Randomize Palette" you'll see that most colors in a theme/palette could be categorized like this:

!theme_primary !theme_secondary !theme_accent

!theme_primary_dim !theme_secondary_dim !theme_accent_dim

!theme_primary_bright !theme_secondary_bright !theme_accent_bright

s/theme/palette/