In Maya create a polygon plane on each of the axis (x,y,z or just x,y for side front).

Create 2 or 3 materials in the hypershade.

Go to the attribute editor of each material, next to the color icon there is a checker box, click it and select file, then using the file icon load the file you want and it will put the file in the material.

Select the plane to which it will go, click on the material in the hypershade and RMB to assign it to that object, thus putting the material on that plane.

Do that for the other materials so that each plane has the correct corresponding image.