We use Ecover in our household, and its fantastic. The Bio powder and stain remover get collar and cuffs nice and white. It looks after clothes and skin, and the fabric conditioner leaves clothes really soft and smelling fresh without smelling overbearing.
Bleach is what fades colours, not the enzymes, Ecover has no bleach or optical brightners, so doesn't fade colours.
If you have dark colours, look for a detergent that doesn't contain Zeolites, they fade darks, so use liquid or programme an extra rinse.