What is your magic formula? I bet there are some imaginative ones, this is how I make my mix at the moment:
10% distilled water
10 - 20% LorAnn candy flavouring
20% 36mg commercial eliquid
30% glycerine BP/USP/food grade
30% propylene glycol BP/USP/food grade
That makes a 7mg/low nicotine liquid which I use most of the day. You can use 60% glycerine instead of using pg or the other way around, use 60% pg and no glycerine. Adjust flavourings, nicotine and water to suit your tastes and make it a decent consistency for wicking onto the atomiser. If it's too thick it won't wick out of cartridges, if it's too thin it will seep out too quickly.