These four photos were chosen as test subjects. They all use colours within the range of blues and purples I was considering using. There is variation in colour distribution, some highlights in white and varying depth of colours.
The first two are works by Tatiana Plakhova (http://www.behance.net/TatianaPlakhova).
The last two are photos from the festival of colours in India (http://diamonds-wood.blogspot.com/2011/03/holi-festival-of-colours.html).