That's what's strange, I went through the entire SH3 directory structure and edited all of the tgas' to blue & tested with no joy, they are:
EndZone.tga
Point.tga
rarrow.tga
vtarrow0.tga
vtarrow1.tga
vtarrow2.tga
vtarrow3.tga
If you find the correct one please let me know.
Reece.