Juliet made this for me two years ago when she was 3. I cut out some valentine images from a magazine and let her mod podge them onto the top of a cookie tin. (It makes a great canvas and is easy to hang on a nail!)
I got it out last week and have had it displayed as our Valentine Decor. You could do something similar with stickers, scrapbook embellishments or pink and red ribbons and heart.
If you don't have an old lid, a fabric or paper covered piece of sturdy cardboard would work, an old plate, or even a big rock would be pretty all decorated with valentines sentiments.
This years book list is coming on Friday, but here is a link to last years favorites if you need a few suggestions!