Oh cool, thanks for sharing your expansion and compilation! Lots of interesting stuff. Have you tested it out on a map yet? I'm interested to see how some of these things would interact. Some of them look like they might jar with each other or get lost when placed together.
I've got a couple things that might help you out with this project.
Over at Open Game Art I made a collection for tiles that I think are similar enough to the Tiny 16 stuff that they could easily be edited to work together. I noticed that you were also starting off with the original tiles from OGA of the Tiny 16 set. If you go to
my resource page you could get the version made for Ace, which could be resized easily enough to work in MV and it'd be all set up with autotiles and animations and so on. I thought I'd included it on the OGA page, but maybe I forgot to update it.
Crazy_Leen also has a huge number of tiles that could possibly be made to work, although getting them may be difficult until her hosting problems are resolved. I've also found in my current project that it's possible to find some really fun and interesting stuff if you don't limit yourself to RPG resources. Gassasin, for example, has some sidescroller tiles on OGA where about half could be used in an RPG with no editing. Actually, if you don't limit yourself to expectations, really. MV and Ace both have some stuff that is supposed to be small, but you can purposefully use them as true sized objects in this scale.
It looks like you have plans to expand. I hope you do, it's always fun to see what people can put together, especially when they can make things to bridge a few gaps between the found parts. I look forward to seeing more.