Water kefir grains can vary greatly in colour from a clear whitish colour to a deep honey. It all depends on what you are feeding them. The different available sugars include minerals like the molasses in cane sugar which is almost black through to refined white sugar crystals. They also impart different flavours to you brew. A brew fed with molasses for example tends to taste more yeasty (like a ginger beer) while white sugar gives a more fruity flavour.