If you have ever made a molded sugar vase, can you paint it with petal dust or with an airbrush or food coloring? I am worried that it will dissolve.
start with colored sugar.
http://www.fabulousfoods.com/recipes/article/223/19924 (though I was taught to put in a lidded glass container and shake the livin' daylights out it, fast and no mess on hands -- or was that just mom's way of keeping the kids busy? )
airbrushing or painting use alcohol based preparations or using dry brush (ie very minimum of liquid in brush and highly saturated color) technique shouldn't do damage.
awesome link, Doug. Thanks a lot. I will try these pointers.