This is a guide to designing your own cut-out card that has a good look to it and can be customized any way you want.
If you want one of these, I made a few extra that are at my Etsy shop.
Step 1: Write Your Message
These instructions are for Adobe Illustrator, but there are other free vector programs, like Inkscape, that are worth trying as well.
So, first write your topical and romantic message in a big bold font. I chose Arial Black. Also, tighten up the kerning, the space between the letters. Overlapping is good.