The following is a tip that Jon Sienkiewicz, a photographer and avid professional writer and photographer, contributed to the 100 in 100 feature on the Adorama website. We've peppered Jon's points with a few fine examples from some of our team members.
To give photos an old-fashioned appearance, use the Sepia Mode. All of the colors will be replaced with varying shades of sepia (sort of a dark brownish-yellow) that’s commonly found in some antique photos. Choose your subject carefully. Old barns, antique furniture and city skylines look great in sepia, for example, but people, food and pets generally do not. Vary the exposure to alter the outcome. Slight underexposure will exaggerate the effect. Some cameras--Sony models, for instance--favor brown tones, while Casio and others are a bit more orange.
Be careful when you edit your images. Some editing software attempts to counterbalance the sepia coloration, especially if you are using any type of Auto Fix setting. Those Auto Fix results will be a boring black-and-white monochrome. The same holds true when you have your digital images printed. Whenever possible, inform your printer that you used a special effect so they won’t try to “correct” the colors by removing the sepia.