I did not want to loose any tiny bit of such a lovely thread and that is why I tatted my usual bookmark - this will be for myself, lol. The rainbow thread worked just fine, a lovely colour and a lovely thread.
The bookmark is not my design and therefore I can not share it, I found it on a Japanese website that is no longer online, as far as I know. I believe the pattern or something very close to it can also be found in one of the Dover books, sorry I can not remember which one and I do not have time to look for it just now. If someone is eager enough I think one of my pictures and the info that there are either 2, 4 or 8 ds between picots should be enough to do it.