Here is the list of Crosshair colors that you can change too.

Yellow [Default Color]
cl_crosshair_color "250 250 50"

Orange
cl_crosshair_color "250 128 50"

Red [Default Color]
cl_crosshair_color "250 50 50"

Magenta
cl_crosshair_color "250 50 250"

Blue [Default Color]
cl_crosshair_color "50 50 250"

Lite Blue [Default Color]
cl_crosshair_color "50 250 250"

Green [Default Color]
cl_crosshair_color "50 250 50"

White
cl_crosshair_color "250 250 250"

Gray
cl_crosshair_color "192 192 192"

Black
cl_crosshair_color "0 0 0"