These sweetheart sachets are from my book, Embroidery Craft: Stitching through the Seasons (2010). They were featured as a winter project because they make lovely gift tokens for Valentine's Day. Little "conversation hearts" without the calories. Also a simple stitching project for beginners. And they are just fun to make!
The patterns can be traced from my book, purchased as a nifty hot-iron transfer pattern that's available here or you could easily make your own with personalized messages. Just be sure to add a 1/4" seam allowance and keep your design image within it. For the record, the pattern (below) was featured as a FREE-WITH-PURCHASE iron-on transfer and is still available as the February motif in the 2021 BONUS Collection. 
BASIC DIRECTIONS:
1. Cut out the test pattern--leaving a margin of paper for pinning. Cut out a small piece of practice cloth. Set iron to Medium-High. Do not use steam. The transfer ink may go through the fabric and is fairly permanent, so cover the ironing surface with an old dish towel or a single layer of heavy paper like a brown grocery bag.
2. Place the test-transfer on the right side of your fabric scrap and place a pin in the margin away from the transfer lines. (If the paper slides the lines may be blurred.) Place the hot iron on the transfer for several seconds, taking care not to scorch. Check progress; leaving the pin in place, gently lift one corner to check that all the lines have transferred. If the image is too light or places have been missed, carefully replace the transfer, matching up the lines, and stamp again.
3. Make sure to stamp the heart sachet pattern on a piece of cloth that is large enough to fit inside your embroidery hoop. For the plain heart, stamp it first, then stamp the desired motif in the middle, keeping out of the seam allowance. Plain linen, cotton muslin or another natural light-weight fabric will do.
4. Work all the embroidery before cutting the heart-shapes out. Separate 6-strand cotton embroidery floss into 3 strands for the embroidery. Basic stitches are used. Use outline or back stitches for lines; lazy daisy for leaves and flower petals; and satin stitch for filling in areas.
5. Cut a 6-inch square of plain or print fabric for the backing. Place the right-sides together and pin in the center. Stitch all around heart using a 1/4" seam allowance and leaving a 1-1/2" opening on the side for turning. Trim the backing evenly to match the edges of the heart. Clip curves up to the stitch line. Turn right-side out and press from the back. Fill with potpourri or stuff with small scraps of quilt batting or cotton balls. Tuck the raw edges inside and stitch up the opening by hand with matching colored thread.
