This actually happened to me, and I thought I'd be clever and make an extra couple of popsicles using a wide mouth plastic cup leftover from our last cocktail party. It made the most unwieldy to eat popsicle. I DON'T ADVISE IT. Instead, cover and refrigerate the yogurt and blueberry compote separately. After removing the first batch of popsicles, make another 1-2 (or however many you can with the leftovers).