I recently came across xkcd "a webcomic of romance, sarcasm, math, and language".
It was started by Randall Munroe who used to work at NASA and is very funny in a "Far Side" kind of way. A lot of the comics would work well as cards, these two would make cute Valentines/Romantic cards.
Check out the website and more comic strips here:
http://xkcd.com/
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