While looking for something else entirely, I found a stash of crochet thread probably 30+ years old. Some of it is size 70...you can't even get size 70 anymore. The larger the number, the finer the thread, and most of my miniatures are size 20. So I was able to make this incredibly tiny cup and saucer - fits on a dime.
Made some baskets for Easter presents, also tiny as a dime but made from size 20 thread, so not quite as delicate. The hardest part is tying the bow on the ribbon and getting it to be proportional to the basket. I presented them inside plastic eggs - inverting the paradigm (I always wanted to say that).