No, it's not Swallowtail (although I have high hopes for that one--I'm on the first border chart). It's not even knitted, which is undoubtedly why it was successful.
I trimmed a lavender plant this afternoon and couldn't bring myself to toss out all that lovely cut lavender, so I turned it into a giant lavender sachet for the yarn closet. This lace heart is about a foot across. I used a piece of scrap lace that used to be the bottom of a too-long curtain. I put it aside years ago when I shortened the curtain. My scrap happened to have a scalloped bottom that was perfect for the bottom half of a heart. I drew the rest of the heart on a piece of paper, pinned it to the lace, and cut it out. I sewed it together on the right side using some red embroidery floss and stuffed it with chopped lavender. It took about 30 minutes and it smells wonderful. Now that's an easy lace project!