I wouldn't iron the ribbons as they could melt. Some of mine were wrinkled and that's what happened. I would applique them.
what a great idea! I would be careful with temp cuz the ribbons might scorch. Also, to preserve as much of the ribbon as possible, I'd probably position the ribbons to fabric or to each other w/o a seam. that is, I'd either place ribbons on top of fabric & applique down or side by side & use a feather or multi-step zig-zag to hold together. good luck. hope you post the finished quilt. would love to see it
Maybe you can contact the person who posted with your questions. Hope this helps.
There was one posted here on the board, last year. I will see if I can find the link.