This is easy to do with Lizzie Anne Designs "So Much Love" set.
I found these little notecards and scallop edged envelopes in my stash (have NO idea where they came from) and decided they were the perfect size for a Valentine.
I used some red patterned paper in a paper pad I had won on a blog some time last year and hadn't used yet. It is from SU!
The notch pieces were cut from Cricut cartridge Accent Essentials. Ribbon is from SU! and eyelets are another item that's been in my stash from a long time ago. I doodled on the white piece and envelope flap with Pigma pen.