RAINBOW CARROTS

The only carrots that I have eaten are the orange ones but I have seen pictures of carrots that are purple, whitel, yellow and red.  This is because carrots can be selectively bred to produce different colours.

In some countries, carrots of different colours are available in health food stores and are called "Rainbow Packs".

In the beginning, carrots were originally purple or red, with a thin root. The orange colour did not become popular until the 1500's when Dutch growers developed the vegetable by selective breeding to make it less bitter than the yellow varieties. 

Research on carrots suggests that pigments in these colourful carrots, which taste just like regular carrots, may help prevent heart disease and cancer, and reduce cholesterol.

Sources:
http://en.wikipedia.org/wiki/Carrot
http://www.carrotmuseum.co.uk/today.html