I have tried this App on my Android phone and I think this is a brilliant free Valentine Postcard app. It has loads of beautiful pictures where you can add on some text messages on the photo and send it via MMS to your love one. You can also save it on your phone, share it directly on Facebook, Flickr, Google picasa or email it. The only thing with this is that you cannot add on or clip your very own photo on it, but otherwise this is a great app.
These are photos of the said App, I got these from Google Market and posted it here just for reference. Note that you cannot click on the install box on the photo below as this is just a photo and does not have a link.