Food Colour Pigments
I've used the artificial food colors. The upside is you can get any color under the sun. I don't like the additives. The downside with natural food color is the hassle although i'd rather boil beets than use artificial. Some of the natural food colors can be bad for you.
I found some really good powders but they only come in a limited range of colours. The kids love playing with it and had fun for hours. Best thing is that these are anti-oxidants, so they are purified from fruits and vegatables, eg lycopene, beta-caretonoid and lutein.
Don't go near the lycopene though unless you can tolerate stains on your clothes and hands!! Its healthy and very potent. Lasts a long time but no greens, blues. I got them from www.coloursoflife.com.au
. The packaging isn't special but at least it is full of nutrients.
I don't know. Everything is a compromise. I have tried spirulina in smoothies. It is okay but it just looks a little too dark green.