The colours in this olive oil packaging work really well as a whole and separately to define each variety...I love the way the pattern subtley adjusts for each label. Fabulous colour!
I also like this example of using colour to define flavours in a range of chocolates, the beautiful contrasts of colour and pattern give them a great shelf presence.
Colour is extremely important to get right in packaging - especially with food, or products with different flavours. When choosing between different varities of soft drink or cleaning products, I often judge the product on colour first, then I read the label second.