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they come with the RGSS that you download and install to run RPG Maker. If you need them, the go to where you installed the file (Usually it was in Program File/Enterbrain/Graphics...I think) If you really need them and can't find them, I can upload them for ya... :thumb:
If you have RMXP installed, open it up, go into the import option, and export the tilesets. That is another way to get at the files, if you can't find the directory.