@CheerBear Just a quick response re the thread for your micro crochet and the tatting thread.
also, thank you for your kind words re my tatting. I do think tatting is so pretty and delicate.
You've piqued my interest with the micro crochet! 
I did some research and noted that some are using fingering weight yarn with 1.25 hooks. You can use beeswax or the Thread Heaven product used for beading for 'hairy' thread if it's not mercerised, but with tatting, that's tedious. You run the thread over or through the wax as you use it. We had to do that on old knitting machines too. I have some Thread Heaven, it sorta works but it leaves a bit of a sticky feeling if you have to frog more than once. Still it can be done.
I wouldn't recommend normal sewing thread as it's breaking point is too weak and any frogging would weaken it further too, making it very frustrating to use.
If you use a smaller hook with the appropriate small yarn and a normal amigurumi pattern, it's supposed to make that item only smaller. Just like you can alter sizes by going up or down a hook and/or yarn with a garment. I have to find a pattern to try this myself.
I wonder if the mercerised threads for tatting would be useful for truly tiny micro crochet - depending on thread size of course. I found a variety of threads under the Theads & Yarns tab at Crochet Australia, who are really good to deal with too. The two big craft chains don't have the thinner threads, only crochet cotton which is too hairy for tatting anyway, it might work for micro crochet though.
Have you found any reference to thread size in any or your images? That could help pin point a start place.
Just remember that with Thread (different from Yarn) the larger the number, the smaller the thickness. I can visualise micro creatures in the lovely mercerised thread, they would be so elegant and finely finished I think.
I might just see if I can find an amigurumi pattern I like and make up one with a tatting thread I have. Most of my threads and tools came from Handy Hands in the US from long ago.
Re selling my work. Yes, so many items of so many sorts over time, now that I think about it. Clothes from day wear to ball gowns, mens shirts, pants (short and long), boys formal jackets, baby clothes from rompers to christening robes. Some to order, some on consignment. Tatting mostly bookmarks and jewellery, some lace edgings too. Crochet garments mostly, although lots of edgings on hankies and washers etc. I craft mostly for myself these days though, 'cos I made some incredibly beautiful stuff over the years and either sold it or gave it as gifts without thinking to keep any of it for myself. I'm a bit selfish with my hand work these days. 
I love sharing tips and teaching others how to craft though, it's such a delight to see someone else 'get' the process and make something for themselves. It's something they then have for life.
I will probably hang out here a bit.