I just love the look of twine or floss wrapped around a card in a random way. I'm not sure what it is about it, but I'm definitely a fan. Design your card however you want, but be sure some part of it is "bound" by twine or floss. If you don't have either of those on hand, use the closest thing you have.
For this card, I have both twine and ribbon, using the Retro Sketch rs#23.