I'm thinking somewhere along the lines of the ones from XKCD (1, 2, 3), but maybe a bit less math-y. Internet geeky is best; perhaps not too fandom-y (though Smallville and House-related pics would work. Or TinTin.). Image marcos and comics work.
Basically something that's not the usual lovey-dovey romantic stuff, but still conveys love. the dorkier the better.
thank you :D