I'm using 'pagan' to mean 'deriving from pre-Christian worship or belief'. Halloween isn't Christian any more, but there's no reason to think any part of it is pagan. As for those eggs, I don't think anyone knows when or how they were first associated with the Christian festival of Easter (wherever that word comes from). As I was saying, you can find the traces of where pagan beliefs used to be if you dig deep enough, but I don't think anything identifiably pagan has survived.