EoNis it possible to have the crosshair3 vtf file but the crosshair being green without changing ingame settings?
Yea, vtf crosshairs can have any color (or combination of colors. There's that thalash VTF crosshair like radu pointed out that combines white and green but you can go full rainbow mode or use the mona lisa as crosshair if you really feel like it). All you need to do is have the in-game color settings be 255 for white (if you use a green vtf crosshair with blue in-game settings the crosshair will turn out cyan. Only a full white crosshair uses the colors you gave the vtf)
Like this it's perfectly possible to make a crosshair color switcher without having to use scripts. Truktruk uses this by having a green, cyan and pink VTF of the same crosshair assigned to slot1, 2 and 3
I made a quick edit of the crosshair3 vtf file. Didn't test in-game but should look like RGB 0 255 0
https://www.dropbox.com/s/6gm39lnfw1ksvnx/crosshair3.vtf?dl=0