Here's how to make your own with ink and stamps. Pick stamps that reflect the mood of the card.
Roses work well.
Cute animals and hearts will do the trick. There are plenty of antique-looking stamps out there. Look for red and pink as well as silver, gold, maroon, and violet inks, markers, watercolors and acrylic paints. Buy greeting card blanks at your local craft store. These come with matching envelopes.