My favourite chocolate bar is "Mars"

Colour indexing!
To take a selection of colours from a photo in photoshop go to Image>Mode>Indexed Color

Set the pallete to Local (perceptual), Select the number of colours you want ( I did 45 for the bunny, to avoid lossing his mouth colour), Forced = None, Dither = none. Hit Ok

Then go back to Image>Mode>Color Table > and Hit save

 

To load them go to the top right of your swatches>and hit load swatches. 

 

 

 

That it is all :).