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Here are all 33 default palettes used in the GB emulator (that I can find).
The first (top left) is used when playing games in regular GB mode.
The rest are used when playing regular GB games in GBC mode.
They are numbered 00-31, left to right, top to bottom.
You can mix and match which palette gets loaded for each of the three
layers (bg, obj1 and obj2).
These also seem to be the basis for the palettes that are included on
the GBC hardware itself, since they can all be reconstructed using
these:
> Brown (UP) : 00/00/00
> Pastel Mix (DOWN) : 12/12/12
> Blue (LEFT) : 30/04/03
> Green (RIGHT) : 18/18/18
> Red (UP+A) : 04/03/30
> Orange (DOWN+A) : 25/25/25
> Dark Blue (LEFT+A) : 02/04/00
> Dark Green (RIGHT+A) : 31/04/04
> Dark Brown (UP+B) : 01/00/00
> Yellow (DOWN+B) : 06/30/03
> Grayscale (LEFT+B) : 05/05/05
> Inverted (RIGHT+B) : 28/28/28
The latest revision of the emu uses 31/04/04 as the default, which is
identical to "Dark Green."