FamilyFun.com has a jump start on easter with this fun candle shell project. Breaking the egg shell and forming a bowl shape sounds like the tricky messy part.
You could dye a few of them different colors for an attractive candle centerpiece and I know my kids would have a blast with this one. We might lose a couple eggs in the process but it’s all in good fun.
Materials needed are simple and inexpensive and it takes less than an hour. For full instructions see FamilyFun’s EggCup Candles Project.