Transparent texture and object with changing color

I am trying to make dice that have transparent texture with numbers over an object that color i can chenge with script. I want to have posibility to change background/object color but not the color of texture. Is there a way to do this with shaders? I don't want to create many diece with different textures.

I tried to modify with no luck this answer: http://answers.unity3d.com/questions/189695/add-color-property-to-unlit-alpha.html