I have found my “U,” for a utopia of stitch options… (well, okay, not quite)
Sulky Underthread or Coats & Clark Upholstery Nylon. I never heard of Underthread as a formal name, but I have had a trusty spool of the Upholstery Nylon for years! It is perfect not only for its namesake, but also for stitching sharp embellishments like bits of metal or securing sharp-edged crystal beads.
No sooner do I get to add these and I am on to the next little challenge, looking for a better answer to “Y.” And sadly, it turns out that my “X” still needs work.
Philosophically, spiritually or sometimes to merely build a collection of threads to love, when it comes to creativity, the important thing is to stay curious (and try to keep my balance!).