Time for action—Finding the appropriate images
Find a suitable image you would like to see on that particular page. You may not know the exact dimensions of the image that you want to replace. You may need to crop or resize it.
Tip
If you are getting images through the Internet, be careful about infringing copyright ownership. You may get images legally through subscription to stock photos, getty images, and so on, but be aware of the terms and conditions of use as they can vary.
Choose the appropriate image you want to use. Save it to your computer's hard disk.
Note
There are various sites that feature free background images for public use.
You just need to search "free background images" and more than 162,000,000 results will appear (at the time of writing).
Some of the good resources are as follows:
http://www.allfreebackgrounds.com/background_select.html
http://www.fg-a.com/backgrounds.htm
http://www.grsites.com/textures/