Okay then, as kinda the opposite of what I thought, this is really simple!
First, open eschaton (I'm using 0.7 (Yes its old but I cant be stuffed getting the new one)) and select bloodgulch.map.
Next, click the carrot(?) to drop down the bitm tags and select 'characters\cyborg\bitmaps\spotlight cyborg' and in the window to the right, click 'Export' and save all the files to a folder (The only one you really need is the first though).
After that, open The first picture in a picture editing program (I'm using pixelmator) and zoom in a bit on the central white part.
Thats the main part you want to edit because its all that you see. I've just added red over the top of it but you can do whatever you want.
Now to import it Just go back into eschaton and select 'characters\cyborg\bitmaps\spotlight cyborg' again and this time click import.
When the window pops up just click load and choose the image you edited for all of them
End result:
Hope I helped!
Note: When the picture imports it flips it to the right. To counteract this just flip your image to the left before you import it.
