One more crazy cat and a question

Here is my latest (and possibly last) crazy quilted cat. It was made on commission for a lady who purchased one of the two that I donated for a craft sale to benefit the local humane society. I don't plan to make any more for the bookstore, as they had their run there.

And here's the question: does anyone have experience using this type of fiber/thread? In a short google search, I found that it is used in Brazilian embroidery or stump work, but not how to use it, for instance, couch it, stitch it with a large needle?
Two skeins are color 81 and the one at the top is slightly lighter and marked 83. I think it might be 1950's vintage, but not sure. It says 100% poliamida, so not a natural fiber.