Originally Posted by Seerah
Download this file (this is the game's minimap arrow).
Color it however you like, but be sure to keep it in 32-bit when you save it, with the transparency still intact.
Convert it back to BLP format (I use the old, tried and true BLP2PNG here on WoWI, which is how I got it into PNG format for you to edit).
Drop it into a folder inside your Interface folder.
Interface>Minimap>MinimapArrow.blp
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This will not work. Minimap Arrow is protected from texture replacment. Also all other things INSIDE the minimap can't be just replaced with a texture