I have a long, dark hallway, what color(s) should i paint it?

[Smurfy]

I want to have all of my decorations/pictures in the hallway also

 

[Why So Serious?]

Anything bright. I love spring colors so I would probably use a pastel blue or green. Hang a few mirrors to help light reflect too

 

[UNCOLA]

I know it sounds boring but I would paint it white. Just use a newer softer white. White doesn't have to be cold and sterile.

 

[ValpoGrad]

You know, I saw a hallway painted two shades of gray. The upper part was a light gray and the lower was deeper - it was really relaxing. They had put black and white photos of their pets and kids on the wall - it was all very soothing to look at. If you like earth tones that might work.
Best of luck to you!