grad Truecolor original (75k PNG)
Quantized for 256 colors, no dither:
DL
DL		 Median
Median cut		 Wu
Wu		 Neuquant with factor 1
Neuquant
CC
CC		 Padie
Padie [*]

room Truecolor original (135k PNG)

Quantized for 256 colors, no dither:
DL
DL		 Median
Median cut		 Wu
Wu		 Neuquant at 1
Neuquant
CC
CC		 Padie
Padie [*]

[*]: Winner (in my opinion.)
Note: those are just two examples. Various images may give various results. 

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