Blending a Color with a Material Texture

I am using Unity 4 Basic. I have a plane with a texture assigned to it that is my transparent shield effects. The texture itself uses white with different alpha for the effect.

I want to be able to tint this material with different colors at runtime for different types of shields.

How do I tint the texture 2d of a material at runtime?

You don’t mention which shader you are using - presuming you are seeing transparency then we can presume you have used a transparent shader! You want one with a colour property and changing this colour in the shader will tint the material. Transparent/Diffuse has a colour property I believe.