I'd like to knit a huge amount of these. I thought about attaching a piece of grosgrain ribbon (or just a piece of yarn) while sewing it together and hanging from some twigs that I have in a vase. I think that would look really fun. Or, attaching them to Valentine's Day gifts. Or, filling with lavender and throwing into a drawer. Or, how about leaving the top open and filling it with little love notes!
But, for now I am just tossing them into a vase in the center of the table. I like this, too. They are meant to be felted. But to be quite honest, I am not even sure this yarn will felt. However, it is the perfect use for all those leftover little balls you have. (Suzanne!) This pattern accomplishes the shape of the heart by knitting short rows. I found a free pattern here that uses increases and decreases to do the same.
If you ordered the place mats (thank you!) remember to decorate them for yourself or for your sweeties. They are still available and if you order before February 7, you, too, can have them for Valentine's day.