I grow three varieties of broad bean at the moment, all 'heritage' types. Red-flowered, Grando Violetto and Martock.
My favourite ... and I mean my favourite broad bean ever ... is the un-named Victorian red-flowered variety. I love it. The flowers are the most beautiful colour and glow in the sunlight. It's a smaller and more dainty plant than a conventional broad bean and grows to about 3ft with three red-tinged stems which usually stay up without support. The pods are small and the beans are pale green and about two-thirds the size of a modern type. But they are very abundant. And the flavour and texture are fantastic. I also found that other than a bit of nibbling by bean weevils the plant was fairly resistant to everything and only mildly bothered by blackfly.
The 'proper' colour for the flowers is a deep crimson with darker burgundy underneath, which fade slightly with age to a deep carmine. But there is some variability among the ones I've grown. Last year I grew six and no two were the same. Colours and markings varied from pale pink to dark cerise, charcoal grey with a pink flush to pale pink and black bicoloured. They were all gorgeous, but I saved seed mainly from the deepest red one. This year I grew 12 plants, mainly from my own seeds, but topped up the numbers with a couple from the original packet. I now don't know which ones were originals and which were mine, but I can guess: I have 10 deep red-flowered plants and two pink and black oddities. So I'm wondering whether the originals had accidentally been cross-pollinated with a 'normal' black and white flowered bean, or whether they naturally have that much variation. Broad beans do cross very readily.