I found this Humble Bundle of tileset resources including some specifically formatted for RPG Maker, could be useful:
www.humblebundle.com
Humble Game Dev Map & Level Creator Bundle
Check out our newest bundle! Get software and assets like Cartoon Platformer Tileset Pack and Pixel Art Tileset Collection. Plus, pay what you want & support charity!
www.humblebundle.com


Reactions: BK-tdm and Featherbrain