A flip flop is for the stretch between taking your shoes off and getting your feet wet. Pool edge, shower block, the walk from your sun lounger to the bar and back. That is the entire job description, and it does not extend past it.
The honest limits show up fast if you ask more of them. There is no arch support in a flat bit of rubber with a plastic thong through it, so anything past about twenty minutes of actual walking and the balls of your feet start complaining. I once wore a pair back from a beach because I couldn't be bothered carrying trainers, and the strap had rubbed a groove between my big toe and the next one that stung in the shower for two days after. They are also useless on anything that isn't flat and dry. Cobbles, gravel, wet decking, a hill, all of it turns into a slipping, slapping mess because there's no grip to speak of and the heel has nothing holding it down. If you're driving anywhere, take them off first, that thin sole slides on a pedal in a way that is genuinely alarming the first time it happens.
They clash with anything you've made an effort with. A nice dress, proper trousers, anything with a waistband that took thought, all of it gets undone the second a bare foot and a bit of coloured rubber appears underneath. They don't sit well with tailoring, they don't sit well with anything meant to look finished, and they look faintly sad paired with jewellery, like you got halfway dressed and gave up. Where they do earn a place is the obvious run of warm weather occasions, poolside, the walk to a beach, a hot flat somewhere you're only in for the shower and the balcony, a garden in July when the grass is dry enough. Hot countries, short distances, bare legs. That's their season and their setting, and outside of it they look like exactly what they are, which is holiday footwear in the wrong postcode.
For colour, keep it plain. Black rubber hides scuffs and sand and doesn't date. White shows every mark within a day. I'd start with a plain black pair and not overthink it further.