Multiple Textures

Hey all!
I am trying to make an open box, with the inside of the box having a different material than the outside. Is it possible/how would I go about applying different materials to the the same shape?

(Using Blender 2.79)

Thanks in advance for any responses!

Use Incoming/Geometry/Backfacing to color mix between inputs, colors (textures), or shader mix between shaders.