Martin Brown wrote:
Prefering dry conditions Pelargoniums, Kalanchoe, Euphorbia Pulcherrima,
Christmas Cactus. Tolerant of over watering Bizzy Lizzie, Spider plant
(Chlorophytum comosum). Some of these can be very easily propogated so
if you do it right you should never need to buy any more.

I would second Christmas Cactus, although mine are coming into flower buds
now, so you may have missed out on the essential start of the progress of
the plant.

Money plants are incredibly tolerant, and if you want to get more, you just
snap a bit off and pot it up!

And cyclamen are flouncy and fairly easy to look after.

Slightly different, how about hyacinths in vases/jars? Then they can see
the roots growing as well as the flowers!