Ok, I forgot to get a card. But I did order flowers, so I didn't need to print some. Well, I whipped up a quick "I Love U" model and printed it out. I think it'll be good enough!

The rendering here is flipped, likely because I modeled it that way. The heart has a recessed area to give it a little more depth, and the letters are slightly raised.

Print, stick on flowers. :)