
When I make a drizzle icing, I just use an American half cup measure and dip it into my icing sugar bag, leveling it off on the bag as I go. Less chance of covering your kitchen in an icing sugar cloud and you don't need accurate measures to drizzle a splish splash of icing on a cake!
I often use a bag of Sugar & Crumbs' Chilli Lime flavoured icing sugar as it's dead easy and I don't have to make my stupidly sensitive hands sore dealing with a whole citrus. The chilli isn't strong enough though so I add upto a tsp of chilli powder to bump up the flavour, depending on how hot it is!