Bronzewinged's avatar
Red, yellow, blue, white and black should be enough for everything. Until you realise that you need two of each due to a red being either warm or cold as is all the other colours (except white or black). 
Gold, silver, bronze and pearly colours could be fun as effects and are as far as I know very hard to both photograph and make digitally. 

I'm doing well with my cold palette at the moment. ^_^