I love sprinkles, and the fact that this exceptionally easy petri dish recipe is exactly 50% sprinkles makes me giddy. All you have to do to create your own is make Jell-O per usual (what, you don’t usually make Jell-O?) and then pour it into the petri dishes. Let them cool in the refrigerator, and give them a dust of sprinkling just before serving them! I wrapped them with skull ribbon that I found at Paper Source so that the bottoms of the dishes wouldn’t fall off when someone picked them up. That wouldn’t be too cute..