You'd be hard pressed to find a more simple yet stunning card collection than that from Letter Pressed. Featuring modern, minimalist design, they have cards for every occasion. I particularly like these ones just called "CARD" because of the awesome deep red that they're printed on.
Sometimes a simple sentiment is all you need, and the hip design is more adequate in this case than some cheesy, "I love you more today than yesterday and will forever love you more everyday" type of line (see, I just made that up on the fly, not hard to be ooey gooey hallmarky.) Plus, with just a plain "CARD" you can use it for any occasion! Happy birthday, thank you for dinner, I love you more today than yesterday...you get the drift. These come in a set of two cards in each foil color (white, blue, orange and pink) with matching v-fold envelopes. Find them along with other contemporary card designs at Letter Pressed!