Next on the list of the main 6 is Fluttershy's cutie mark. The only annoying part on this design was getting the antenna's of the butterfly's just right.
Here is a version on some scrap fleece, the rendered version, and a pic of the design on a fluffy towel.
You can download the embroidery file here.
Pink - 2179 (wings of butterfly)
Light Blue - 2233 (body of butterfly)