Wow, it's been a little while since I've updated this.

Time flies when I'm trying to get a grasp of ASM (which is going slower then a snail in a traffic jam), working on a side project (a Starfox text hack I'm gonna submit to BHDN in the hopefully near future) AND doing my favorite thing - playing around with FF4.
Since my nasty issue mentioned above has been taken care of (hurray for backups!) it's time to add some new stuff!
Attached to the post are the following:
Cave Tileset edit with a pointy rock replacing the original, broken rock thing (both on land AND in water)
Sealed Cave Tileset edit that replaces the save point stones with a second torch-thing for the animated fire.
As usual importing these are as easy as tracking down the tilesets in TLP (unheadered offsets available at OP's attached text file), and importing the .bmp image in the right spot. I'll always reccomend TLP over YYCHR for importing graphics, but I'll always reccomend YYCHR for actual graphics editing.
Enjoy! Feedback is always apreciated, as it helps me get better at this faster (and means better graphics being posted faster for others to use).
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CURRENTLY IN THE WORKS:
A replacement graphic for the Black Chocobo. Well, technically it's pretty much done, but I'm holding off on it's release for awhile (at least until some form of FU ReMIX is available) as it uses the Lunar Whale's palette and requires some hexing to get it to look right.
To make it look right I toyed around with the vehicle palettes for a few hours before saying *#@% it and copy/pasting the entire line of code with the Lunar Whale's palette (line 4) over the line with the Black Chocobo's palette (line 2).
The result? Oddly enough, everything looks fine outside of "Carried Hovercraft" also having the Lunar Whale's Palette (which looks so damn awesome I'm half attempted to make the normal hovercraft share this palette) and the Enterprise having a Red Wings palette during the event where you enter the Underground (though it has it's normal palette during the chase scenes after Bab-il, and looks normal any other time). I'd call that the lucky break of the century!
I'm also looking into redoing a large part of the Town tileset to be more reminescent of FF5 and FF6 (pointed-roof style houses so every single town won't look like Tatooine). I'm not giving any set time frame on that, but it's on my to-do list.
And before this post becomes the size of a novel (which it likely already has being so long since I've posted in this thread) I've redone the graphics used for the "White Magic Cast" animation to not be spinnig cubes. Instead they're more akin to later games ("sparkles of light" was what I went for). Only downside is that I had to edit a corner of the small heart graphic used for the "Enemy Confuse" (whatever Lamia/Lillith uses to confuse party members). If that peaks anyone's interest I'll post that up next!