Although I tend to follow the style guidelines, I like tan shoes and wear them even with darker suits. However, I more often I do reach for shoes in a darker shade. In my line of work, clothing/style/color combinations are really not that important (except maybe with a handful of patient that I see). Be aware of the guidelines and deviate as long as you're comfortable.
Next time I see someone shake their head next time I'm wearing my whiskey DM and a dark suit, I'll know if you pB (especially if the person is wearing black shoes)!