I'll be honest here and this isn't specifically an iPhone thing...
But you can always change the colour of your phone with a skin. And a lot of people put their phones in cases (which also makes the whole 'thinnest phone' thing kind of weird).
So what is the obsession with the colours that the phones will come out with?
The iPhone 18 Pro is still far off, but new leaks are already buzzing about a big aesthetic shift. Apple is rumored to embrace warmer tones by introducing three all-new colors. The leaks also suggest the brand is skipping the traditional black or Space Gray finish.