greg, i think i know what you mean, but i want to ask you something,
are you trying to make a new tile skin? if so, you create a new skin in the tile editor, and you can make your images in photoshop and save them in the new tiles skin folder and then import them from there into the tiles editor....
i hope that is what you meant......and i hope this helped... if not just tell me and ill try my best to help. andy will too, he is way more cluey than me 