This does exactly what it says, getting rid of the GB placeholders in the Firebird tileset and replacing them with appropriate spritesheets that better fit the terrain. Be sure to use these if you're going with the tileset for maximum consistency - just a small warning, some of the tile patterns don't line up exactly with the .png files here, so you'll need to do a minor bit of thnking to properly implement them.
Definitely worth having to complete your set, would recommend without hesitation!
