I've posted a question over in cakes & bakes, but realise you lovely crafty lot might well have an idea, used something for other crafts, so posting my link here too - I hope thats okay - please take a look - thanks :)
www.mumsnet.com/Talk/cakes_and_bakes_pictures/1661679-Sugar-Crafters-over-Here-Please-HELP-Crochet-Look-Icing