Nancy, Your rainbow dishcloth reminded me of something neat that happened to me today. I have a pen pal in her 80's, who made me a rainbow thread crochet bookmark with a forest green 1/8" long ribbon on it. It's so pretty. She says that she can only make lightweight small projects now because afghans are too heavy on her now. I'll ask her if she knits, too, or if she ever crochets dishcloths or hats, because they're small, too. Her workmanship was so impeccable and perfect. Wow!
I have a very difficult time seeing small work and coordinating my fingers/thumbs, when crocheting with the tiny hooks, so found I can't do thread crochet. However, if I use a skinny/little hook, with baby yarn or sport yarn to crochet Barbie clothes, I CAN do that. I think it's because the yarn's more yarn-like and stretchy, whereas the thread doesn't stretch, so the gauge needs to be tighter. I can't seem to keep the gauge tight on the thread because I'm practically looking cross-eyed at it and it's sliding off my fingers/thumbs.
I've found that crocheting up bulky yarn is a lot of fun. It's nice, too, because the projects are so very warm and in no time at all, they're completed. Also, 2-strand projects are fun for me, because it's like bulky projects, except you're using 2 strands. For 2-strand projects, it's fun to do 1 strand variegated and 1 strand a solid matching or contrasting color. Also, it's fun to do 2 CC together or 2 colors the same color. You can get all sorts of different effects using 2-strands.