This was the first finished crochet piece I made when I was learning last summer. It’s “small” rather than “micro” and was made with fingering weight yarn (3-ply Astracryl from Tamm Yarns, bought on cones for machine knitting from the Knit Knack Shop in Peru, Indiana) instead of thread. I used a 1.25mm hook from an inexpensive hook set I had bought years ago. I’m planning to take super-closeup photos of several kinds of hooks soon to show the differences between different brands of hooks, and the relative difference this makes with hooks of different sizes.
The pattern is called “Crocheted Surprise Eggs” and is available for free at 5littlemonsters.com. It was easy to make and a good introduction to the techniques used for amigurumi in general, including the “magic ring” method for starting crochet in the round. There’s some shaping but it’s straightforward. The egg piece is 30 stitches around at its largest part, which is about as big as you want to go for a micro piece. There are five different animals to choose from, all differentiated with simple and clever details. This piece is only about 1.75” tall even in this relatively heavy (for my purposes) fingering weight yarn, so the pattern would make quite a small toy if you made it in finer thread.