Place number on cake, sprinkle with sprinkles. Okay, this was a cute idea, but time consuming, trying to the sprinkles onto the cake. And the number stuck so I had to refrost the bare portion. Cake was a huge hit though!
birthday centerpiece idea -- tie balloons on top--fill with any candy. let kids guess on paper how many pieces of candy are in the jar. one who is closest gets the jar at the end. Could work as table numbers/center pieces too!