I just bought a number of acrylic/polyester shawls on clearance and would like to embellish them for Christmas gifts. I need ideas!

They are black, lined in charcoal. I am an artist, but just a beginner when it comes to embroidery. I would love some ideas on what to put on the back of them to make them something unique and special. They are for three daughters in their late 20’s, who attend music festivals and prefer the darker side of things. Also for my mother, 70 years old and looooovvvvveeesss Elvis. Seriously. Can anybody help?