I got a question. What if I want create a colored light texture? I know I could change the color of the light itself, but that´s not what I mean. I mean if there is some way to assign the colored picture to light as a texture, which will be seen on the objects, where the light is shining?
Maybe what you need is a projector
You can assign a texture to it which will be projected on your object
Thank you. 
That could be what I was locking for.