Selhars, there are very few plants I can think of that flower and thrive on neglect. While azoria is right to some extent in that African Violets seem to be on many of the 'hard to kill' indoor plant lists. I don't think they match your needs and are tricky because of disease, lighting and water on the leaves issues.
The problem is that most good and avid gardeners tend to be nurturers. They'll take hopeless brown sticks and talk them back from the brink and lavish careful care until they have a lush specimen again. Of course, on occasion they can be ruthless, too, and toss some misbehaving wayward plant like a weed. This need to nurture runs counter to the care you want to give plants.
Many plants can be tough, eventually, but many need a lot of tender loving care to get there. I can think of only a few that will make the transition from nursery to your home that fit the bill. I may have a few more as I mull over past experiences. It took a while to find links for all of these but here goes:
Crown of Thorns:
Succulents
Crown of Thorns Plant - Euphorbia milii - Picture, Care Tips
Christmas/Thanksgiving/Easter Cactus (there are different bloom times and the branches look different):
Thanksgiving Cactus, Christmas Cactus, Easter Cactus: What's the Difference? (University of Illinois Extension)
Hoya carnosa aka "Wax Plant" - It has tiny flowers
Wax Plant - Hoya carnosa - Picture, Care Tips
Hoya carnosa
Hoya - Plant Palette - University of Illinois Extension serving Dewitt, Macon and Piatt Counties
Not flowering but interesting looking and some are very colorful:
Haworthia: these are great in low light conditions and form leaf rosettes that look somewhat like flowers the Haworthia:
Haworthia - the jewels of the succulent world
Echeveria:
Glenhirst Cactus Nursery UK - Echeverias For Everyone
In the same vein there are quite a few
sedums that would work if you have a fairly sunny window for them:
Sedum - sedum plants
The following is rare but the one I have has been doing fine on neglect in the garden.
Lewisia cotyledon It isn't known for being a houseplant but it can be if it gets enough sun:
Lewisia ‘Little Plum’ (Lewisia cotyledon)-Logee's Greenhouses There are other Lewisia that may also be good
Bitter Root Lewisia Plants, How to Grow and care for a Lewisia cotyledon - Garden Helper, Gardening Questions and Answers but I have only had the one above. They all need quite a bit of sun time though and may be better as outdoor plants for you.
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