Here's a few we came up with. And if you have any ideas or want to create a few of your own, please send them to firstname.lastname@example.org and we'll post them!
If those tweets in the Storify don't work for you, right-click and save the images below and print or post at will. Thanks!
NPR also created a beautiful collection of Valentines... you can view them all here.
KQED joined in the fun with SF-centric Valentines. This one really speaks to the whole state.