My kids created their own cards this year from this GREAT idea over on the 27-7-385 blog. A couple of alternatives to the sucker would a glow sticks, a fun themed pencil or pen, sugar daddy or even a stick of gum. ( the gum would work great if you are needing to mail some of your valentine's cards)
and what about a pocket kiss for your sweetheart or to send to someone special! Color me Katie has a darling flip book idea!
both ideas are quick and easy and there is still plenty of time to whip them up! (especially with 1 hour photo!)