1) - Open your map. 2) - Go to extensions-> Edit Tileset 3) - Edit your tiles to whatever you wish (up to 16 tiles) 4) - Once you click OK it should save. DO NOT SAVE AFTER THIS (last time I did that the tiles get reset) Just IMMEDIATELY exit WE without any afterward stuff, and then reopen it. Open your map and you should have your tiles. Yes, it is completely possible it is just that people aren't really fond of what you are supposed to do. I wasn't until PitzerMike told me to reset WE.