These little 1920s cards are some of my very favorites, and comprise what I refer to as my "Mundane Objects" valentines. I've found these over a number of years from different sources, but they seem to make a set. Many of the messages inside are puns, and feature a lot of intriguing historical slang.
The brick reads: "You're a Brick...I'm 'Building Up Great Hopes' That You Will Be My Valentine"; "the pie: "If I Only Had the Crust...I'd Ask You To Be My Valentine"; the cork: "Gee! But You're a Corker...That's Why I Want You For My Valentine"; the briefcase: "To Make It Brief...I Have an Awful 'Case' On You"; the glove: "Do You Glove Me?... Be My Valentine"; and the plum: "I'm Plum Crazy About You!...Will You Be My Valentine?".