I'll show you the other ones later but first up is my Valentine's version. I decided to go with a big heart on the front, which I know is not immediately what you think of when you think V-day, but I like to live outside the box like that.
There might be a million tutorials for reverse appliques, but I thought the internet needed just one more, so here's how I did it.
And pin. (coordinating pins not necessary but infinitely cuter)
Lay your stencil on the bodice where desired and trace around it with a water or air soluble marker. If you have lots of distractions (ie: kids), I recommend water soluble. Who knows when you'll get around to the next step.
Then hand or machine stitch directly on the line you drew. I use the triple stitch on my sewing machine which is meant to give susceptible seams extra enforcement, but also gives a nice highly-visible stitch line for machine embroidery. You could also use a fancy embroidery thread and change your needle appropriately. Variegated thread might be fun too. Oooh, how fun would metallic thread be? Ok, now I'm literally getting distracted by shiny things. Back to business.
Now, ever so carefully, separate the two layers and cut a small hole in the top fabric only. My pink layer is uncut underneath.
Then carefully cut out the shape with a small pair of scissors leaving a small, even edge of fabric around the stitch line. You can get closer to the stitch line than I did, it's totally up to you. Knit tends to curl at the cut edges though, so I didn't mind leaving a bit of excess.
Here's my little Valentine in her new dress!
This one is very bossy during a photoshoot. I get an estimated one shot my way before she starts calling out orders. This time she told me to just keep "pressing the button" and then started voguing. These poses were all done within a second of one another, just to give you an idea of how ridiculous she is. She's 4. So very very 4.