How do I create a custom backsplash?

I am trying to create a custom, 18" backsplash and apparently making it much harder than it needs to be. When finished, I would like to use it in my cabinet specifications. The 18" splash will be comprised of three, six inch rows of tile. Each row will be unique and I have downloaded images from the internet.
I would appreciate any help here as I am new this.
Thanks!

Some of these Help Database Articles may be of help to you:

http://www.chiefarchitect.com/search...put=xml_no_dtd

DJP

Thanks David. I will go and check them out!