For a romantic occasion here is an idea for heart themed chocolates and card...
Top Deck Chocolate Hearts
Origami Heart Card
This gorgeous card idea I got from Eat Drink Chic blog. It was really easy to make, I only had one practice run.
For the envelope I used an embossing paper used in card making which is thick and sheer and punched holes with a needle up the sides then threaded through a pink thread.
The card opens up so you can write a message. The ribbon I just attached by punching a hole on the back flap of the card.