We've long loved a brightly-colored front door. Or even boldly-colorful interior doors. Here's another idea that's related to these, but doesn't involve the door iteself:
Paint a door frame in a standout color. In an open doorway, it'll make you feel like you're really passing through an important threshold. Take the pictured example, for instance. In an otherwise neutral room, this door frame stands out and just beckons you to pass through.
What do you think?
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Image: via Luxe + Lillies