If you're one of those people who has a hard time bringing bright color into your space, painting the door can bring just the hit of color you need without overtaking a room. Exterior painted doors are commonplace, but interior doors in bright reds, blues, and yellows are more rare. A colorful door can make a neutral room pop, and it's easy to repaint if you change your mind...
For more examples from AT, see these posts:
• Colorful Interior Doors
• Colorful (Exterior) Doors
• Concentrated Color from LASC Studio
• Color Chips: Dublin Doors
• Look! 1 Block, 3 Yellow Doors
Photo: Marais Doors by chelseagirl via Flickr Creative Commons License