You surely noticed the boring grey background on your layered pages, right? If you REALLY want to, you can keep that grey color but you will probably want to change the color to something brighter or at least, more appropriate for your page.
You can change the background color to something more interesting than the boring grey.
Activate the Background layer in the Layers palette.
You can choose the color using the Dropper tool on your photo, or in the Material Palette.
With the Fill tool, you can just fill that Background color.
If you want to add a texture, you can use the Texture effect (under Effects > Texture Effects > Texture) or add a new layer that you will fill with a different color through a texture in the Materials palette.
Here is my page after adding the background.