General Idea for Inserting Graphics
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(Note: Example used here was Title Screen, but this can be used for many things.
It is just the general idea and does not serve as a walkthrough or tutorial)

First of all, before you try anything, back up your ROM in case
something messes up.

Use GBA Graphics Editor (find it at http://www.feshrine.net/hacking/graphicutil.html)
and load your FE8 ROM. I recommend setting the palette to Grey Scale using the
palette control. Then use the image control box and navigate through all the
graphics until you find something that looks like the title screen.
It'll probably be around other menu graphics and the such, although I'm not sure
(it won't be in the middle of all the portraits or map sprites or anything).

Now you need to find the palette for your image. See a palette editing tutorial
for how to locate palettes. Take the offset of the title screens' palette
and put it in the palette control of GBAGE. If the option to use a
Compressed ROMPalette comes up, then click that. You should now see
the title screen and/or any parts of it (such as the brown scroll thing,
depending on what part of the title screen your are hacking).
Save that image, edit it using an image editing program (making sure not to
change the general layout/arrangement of the image and keep the image 16 colors or under)
and then reinsert to a new, clean area in the ROM using GBAGE.

Make sure that the palette is imported and the graphics are imported but that
your new image doesn't overwrite any other images. Save your ROM and test.
If everything was done correctly, your edited title screen should work out.

Note that there are limitations to what you can do.
Use common sense and you should be able to get it working.