Thankfully, not much as been updated in our Mid-Century (1953) home to mess with its architectural integrity, but that doesn't mean I'm less anxious to make some changes myself. Taking into consideration financial resources, project priorities (kitchen first) and careful planning, sometimes a quick fix will do until the time is right for that big undertaking. My favorite one is replacing the hardware on cabinets, doors and drawers. Our home office, guest bath and master bathroom got a new look with very little effort and investment just by changing-out the existing pulls and, sometimes, throwing on a new coat of paint. Take a look:
My favorite place to look for knobs is Anthropologie, although I always have my eye out for them at garage sales, flea markets and vintage home stores.
Take a look at this Pinboard for an array of hardware ideas.