go to "C:\Documents and Settings\Administrator\My Documents\My Spore Creations\Creatures\"
And just put all of them there, without the folder just all the image files into "\Creatures\"
You just start the game, open up the Sporepedia, go to the Everything tab along the side, and Drag all the PNG files into it. It will automatically load up every single thing you drag in there into a working creature/vehicle/building for your game. =D enjoy. Please help seed.