Do you just love the surprise and contrast of black trim work? I think sometimes we get so used to just painting all our trim white that we forget there are lots of other options, including black. The black window frames in the kitchen below provide a nice contrast, without overwhelming. They work because they reference some other dark elements in the room.
The beautiful historic architecture of the space shown here is accentuated by the boldly painted trim work.
Who doesn't love a black door?
This room feels light and airy, but the pops of contrast provided by the dark trim keeps it from being to precious.
The dark painted trim in the traditional room below makes the space feeling elegant.