Why is my textured material showing up as a solid color? I'm trying to use a simple oak texture on this cube but it just shows up as a solid color.

I tried every option in the image texture (linear, cubic, flat, etc.) none of them worked in fact  I saw no difference between them.
Do you have Cycles render engine enabled?
If so, try adding a texture coordinate into the vector input to tell blender how to wrap the texture to a given object.