Pairat Songpanich illustrates how different seedlings of a cross of Nymphaea can be in Diversity of Waterlily Seedlings in a Single Hybridization and
More Diversity of Waterlily Seedlings in a Single Hybridization.

Here Christian Meyer provides similar examples for Nelumbo. Though this was a deliberate cross, please keep in mind that even self-pollination of a hybrid will produce varying offspring.