...For what version of RPG Maker? And what kinds of sprites? Battle charsets (RM2k3), Battlers (RMXP), Charsets (RM2k3, RMXP), Facesets (RM2k3), Weaponsets (RM2k3), pretty much every resource that's not music is a sprite of some sort, and each is pretty much unique to the version of RPG Maker (with a few exceptions).
Because I have no idea what you're looking for, I'll just throw out the standard links:
I think I've got some FF7 rips somewhere in my rm2k3 rtp. I'll put them into rmxp format for you some time soon.
I've just found them...and they're FF6. Is FF6 OK? Or do you want to be stubborn with Lenny again?
Right, I've got some ff7 rips. I have editted them for rmxp, to see how to put them in, just look at one of evilleprechauns posts that I have answered. The one about NPC's I think. It says how to import them there.