Hiya
Have just started keeping myself & was lucky that my OH bought me a lovely (expensive) cedar hive last year, so I don't need to treat it for ages
I used to help my dad with his bees & he used to paint his hives each a different colour - suppose it works ok with the WBCs, would look a bit odd with the Nationals after a while (unless you fussed about changing frames across & annoying the bees).
ANYWAY - what ever colour he painted them, he would always make sure he used light, pastel colours - he reckoned dark colours got too hot in the summer.