Color Balancing

A while back I jumped in front of the camera for a fellow photographer, James Westman to color balance the shot. Not a bad photo of me. Always remember to custom white balance it will save you a headache later. My favorite to use is WhiBal Pocket Kit. Its small so you don't have a lot of extra bulk to carry around if you go on location. They are also a sturdy plastic card.
But if your ever stuck without a grey card you can always find an old Polaroid and use the back I have on stuffed in every camera bag I own.