I'm working on this one currently.  Dark and faded photos can come back to life (I'm the handsome one on the right!).

Other restoration options (price per photo):

Faded photo without damage:  $5

Faded photo, minor damage:  $10

Irregular faded photo:  $15

Sun-damaged photos:  $15

Low damage restore (1-2 folds) $15

Medium damage restore (3-5 folds) $20

High damage restore (folds across faces in many directions):  $30

Severe damage restore (missing facial parts, unrecognizable features, fading with damage) $40