For replacing SNES Advance graphics.  Run MAKEGFX.BAT and copy FONT.BIN, 
FONT.PAL, BACKGROUND.BIN, BACKGROUND.PAL to your snesadvance.exe directory.
Font should have 16 colors, background can have 256.

(Credits)
GBACrusher - John Sensebe
GFX2GBA - Markus G.