This is for RPG MAKER VX ACE (it also should work on RPG MAKER VX). I'm uploading it here because it's free to use. The tilesets are from an old japanese site, which now is closed. But when the site was working, they said that all resources were free to use in any kind of project.
Please, use this in your project freely. Feel free to change anything. Just have fun.
You can copy this directly from the RPG MAKER editor from one project to another. That's the fastest way I've discovered. If you know other way, please share.
Remember to take the tilesets from its folder and correctly place them in their categories in you project in RPG Maker. They have the same names, so, it won't be hard.
If you need any help using these resources, leave a comment below.
Greetings and good luck with your project!