These charm have been made from US postage stamps. 
Stamps have been applied to plastic charms and sealed.  Each is single sided unless otherwise noted.

Charms, keys, and chains sold separately.  Photos show possible combinations of charms and chains.

LINUM:  Approximately 1" square

LOVE:  Approximately 1.5" long

QUILLED HEART:  Approximately 1" square
For just $2 more add an adorable red key.  (.5"w x 2"h)

RED SQUARE:  Approximately .75" square

SINGLE HEART:  Approximately 1" high x .75" wide
For just $2 more add an adorable red key.  (.5"w x 2"h)

YELLOW FLORAL:  Approximately 1.5" long