Ive got a plane setup with halo material in blender internal, but i cant for the life of me make it anything other than one solid color. I would like a mix of color from red to blue, ive tried making a texture of type blend and adding a color ramp, and then i checked the texture box in the halo material but nothing happens, so i guess thats not how to do it.
You could make and use an image texture to define your colour. Example linked.
Redbluegradient.blend (507 KB)
That seems to work quite well thanks.