Squishy to the rescue!

Ok, I'm here to clear up a few things about editting the title screen!

First off, the title screen is composed of many different layers of gfx. Here is a list of which ones I editted:
A6000 -uses Mode 7 8bpp- this is the tiles used for the background of the title screen
A80D8 -uses SNES 4bpp- is is the "SUPER METROID" logo and the "NINTENDO" logo
AA5E1 -uses Mode 7 8bpp- this is the moving metroid in the title screen

You can obtain these by: TOOLS -> GRAPHICS EDITOR "SPECIAL GFX" then choose which one you want, and click "RIP" to save them back to the ROM click "SAVE"

Now, you'll notice that to fully edit the title screen, your going to have to edit Mode 7 gfx, which is NOT in Tile Layer Pro. So, what does one do? Well, I used FaTileTy.
Problem is that now, you don't have a pallete, which would make editing all this rather hard. Good thing that the Ceres tileset uses 'about' the same pallete as the title screen does.

goto a ceres room, or change the tileset to #16 then TOOLS -> GRAPHICS EDITOR "PALETTE EDITOR" and click "EXPORT PALETTE"

So you'll want to rip two copies of Graphic Set 16. One as .tlp and another as .fpl (you can change how to RIP your palletes by: FILE -> PREFRENCES -> PALETTE FORMAT.

Now you 'should' be able to change to your hearts content, but doen't forget to SAVE back to the ROM!