A quick way to surprise her today would be to send her an ecard like the ones found here (especially if she works on a computer all day) what better way to set the tone of the day than surprise her in a way she is not expecting!
Valentine's Day Cards, Free Valentine's Day Ecards, Valentine's Day Greetings From 123Greetings.com
and for the ladies of the group, you can send him one as well:
They have both funny lighthearted ones or more serious ones such as this:
Love You More Than Words Can Say..., Valentine's Day Couples Card For Him