I also used scraps of velvet from some of my daughter's baby dresses, some satiny stuff (sure it's poly) and all kinds of stuff I could forage (DH kindly donated a gold silk tie!) All the usual quilting rules just fly out of the window! Any fabrics I couldn't turn under, eg the velvet, I just covered the raw edge with the next patch or a strip of ribbon. And as for the embellishments - if ever you get fed up with buying fabric (???!) this opens up a whole new shopping prospect! I've even used bits of broken old earrings, and I got a big bag of old beads for next to nothing from a brocante (French jumble sale).
Have fun!
K x