Any flowers I can grow that'll be happy indoors?

[SneakyGremlins]

I have almost no room outside but several large, sunny (6-8 hours a day) windowsills where I'd love some colour. Are there any flowers that are happy indoors?

Geraniums and Begonias are happy indoors, many people grow them in conservatories.
Also African Violets.

Orchids - phaelenopsis - flower for a very long time, easy to keep / thrive on not too frequent watering / if fed will flower year after year.

I have four in my flat - all bought cheap from the supermarket and all in their fourth or fifth year of flowering. I soak them once every couple of weeks and feed about once a month - otherwise they look after themselves.

Thanks for suggestions! I also meant to add I have a cat - so nothing toxic!

Streptocarpus there are some fabulous cultivars available these days, much easier than African violets (which can be rather fussy) and happy with a cool location in winter. In flower all summer, maybe the only disadvantage is that the strappy leaves can grow long in some varieties, but can be trimmed back if necessary.

I bet a gardenia would grow on a sunny windowsill? I'd love to grow them outside, but they're not hardy.

Noted! Thankyou

For a hot sunny windowsill then geraniums are your best bet - anything else is likely to get scorched.

I had a gardenia on a south facing indoor window sill last year. It thrived. Grew too big for its pot and a bigger pot won't fit on that window sill which is such a shame. I had loads of flowers from it, they come out white and then go to a deep cream, lovely glossy leaves? I watered it frequently.