Orchids, stefanotis (lovely smell), African violet, hibiscus, gloxinia, Gardenia (another lovely smell), streptocarpus - wonderful colours and how about an amarylis - they produce wonderful big blooms.

Don't put them directly over a radiator though as the rising warm dry air is hated by lots of plants, especially African violets and cyclamen, which are actually happier on a cool sill out of direct sun.. You've got a lovely selection there to be going on with!

Even Kalanchoe.......got a pretty double orange flowered one in a purple sack for Aunty and she loved it. ( m&s bye the way....)