Author's Notes:
To install:
Place the 'generic_textures' folder inside your 'mods' folder
To create your own:
Open the DDS 't_player_indicator0_red.5fb75dd850a755ff' and replace with your own texture. Save as DDS and select BC7 (Linear, DX 11+) Compression speed 'Fast'.
Find, open the IFF of the indicator you want to replace inside the generic textures folder, and replace the DDS texture with the one you created.