Crazy quilts use all types of cording, lace and such. I bet a lot of people would be interested in seeing how that could done with specialty feet. The most attended sewing display at the IQF in Houston was a lady demonstrating binding by machine so that it looked good. I don't know if she was using any specialty feet.
I'd love to see bobbin work (using a heavier thread in a bobbin), and maybe cording.
Could you give us a list of the specialty feet you can use and what they are typically used for? Or how they could be used in quilting?
I had thought about using the blind hemmer foot to put the bias binding on the back of QAYG blocks. Don't know if it's possible.