Erin Jang of The Indigo Bunting has designed simple, witty food valentines for Paperless Post this year. I am in love with these designs... the only downside is that these can only be sent electronically. The upside of electronic delivery via Paperless Post is that no advance planning is required!
We always use Paperless Post for invitations to parties, etc. - I love their designs and customization options. For a small fee, you can send and track invitations, access fantastic designs, and customize your invitation in numerous ways including fonts, colors, envelope liners, and stamps.
All images credit to The Indigo Bunting.