Those are way cool. I like the 1920s Art Nouveau look of the Ozma book.
I think I've mentioned before that I loved, loved, loved Wizard of Oz as a kid (still do, in fact

). And so I got one or two of the "other" Oz books for Christmases and birthdays. For some reason, they just never clicked with me -- the storylines felt "weird", and in one of them (Scarecrow of Oz, I think) I was turned off because the artist drew Dorothy completely different than in the original.

All of the books were lost in one of the moves somewhere along the way. I did buy myself another copy of the original WoO a few years ago, it's just like the original except in a much smaller format. And earlier this year I bought an audio dramatization done by the BBC -- really well done (I now want to get some of their others). It's such a wonderful story.
How many books do you have? In my current edition of the book, there is a section at the back that talks about all the things that have been inspired by the original book. Baum wrote 13 sequels, and after his death seven other writers wrote a total of 28. Lots of fodder for happy collecting!!
Would also love to see some of your figurines, if you have time one of these days.