PSA from Obama's EPA: Give a shrub for Valentine's Day...

They also suggest you make your card from scrap paper...

Via EPA.gov:

This Valentine’s Day, show your love for the earth by sending recycled-content greeting cards. Consider making new cards from scrap paper or by attaching new backs to the fronts of old cards—this can be a craft project for family and friends that helps everyone reduce paper waste while saving money! Also consider sending electronic valentines.
Bake cookies or other goodies for your valentine and package them in reusable and/or recyclable containers as gifts. Home-made goodies show how much you care and help you avoid packaging waste. Consider also buying long-lasting silk flowers, potted plants, or live bushes, shrubs, or trees that can be planted in the spring.