There are some awesome tiles add-ons on this site, primarily for RMVX/VXA. It’s in Portugese, but it’s easy to navigate and figure out. Well worth a visit if not to download anything, then just to browse.
The Magnum of Noches
This is a very good, resource-rich site. Sadly, however, it was announced that updates to the site have ceased. Many of the resources are still online and ready for use, but make sure you credit the original creators accordingly.
This site does have quite a number of quality resources and materials, from iconsets to sideview battlers. It’s well worth checking out.