Blender Issue -- Textures

I am currently working in Unity Pro, and using Blender for my modeling. In Blender, I give my object 4 materials, one for the walls, one for the ceiling, one for the floor, and one for the doors.

The problem is, when I set images for the materials in the property inspect within unity, instead of being the texture as it is shown on the image, it is just a solid color that is close to the texture on hand. Is there a particular reason for this? Am I doing something wrong? Any help is much appreciated!