I've always been fascinated by ordinary things done on a very large or very small scale. Examples of large scale crochet are fairly common as t-shirt yarn becomes more popular. I haven't seen much on the small end yet. My smallest steel hook is a #10, 1.30mm. It's too small to use for even the smallest crochet thread I have so for a while I've been thinking about using it with sewing thread or embroidery thread and seeing how small a project I can make. I started with a single strand of sewing thread, but that turned out to be too loose and hard to handle so I held 3 strands together and it seemed fairly proportional. Splitting is a bit of an issue but surprisingly the thread sticks to its fellow strands pretty well. Having a lighted magnifying glass stand comes in handy for little things like this.
I haven't done anything too exciting yet, just a little test piece but it would be fun to think of little projects to work up in the scale.