Thank you for your responses. I have tried most of your suggestions, but haven't managed the results I'd hoped for. I will check out the machine embroidery sub-thread. The pattern picture shows the gold outlining to highlight the profile (?) of the unicorn. I tried several different needles/sizes, and ordered the top-stitch needles from amazon (arriving tomorrow), and, even attempted hand-embroidery. Not a good look. Luckily, I have enough leftover scraps to practice on, until I get the look I want.
I have a few more things to try - the top-stitching needles, contacting pattern designer for info on how she did it, and if all else fails, guess I'll take it to a local embroidery shop, and have them do it.