Calling all my Bloggers!

Okay all of my blogging buddies...I need some help! I have tried and tried to get a new background from other sites to make my blog as cute as all of you!!

Questions:
1. What sites do you all go to...I am not a scrapbooking person..and I want it free...is this possible?
2. After you have downloaded a background, how do you get it to be a template for your blog!

Have have seriously spent hours trying to do this! With no luck and a lot of frustration...I consider myself a little techy....I am the tech support here at my house with Troy(sorry, you know it is true!) So why can't I figure this out!! Please help me!