Adding a background images may make your blog attractive and also slow. If still want to add a background image to your blog , use a image of small size. ( i mean , less in Kilo bytes. If your background image is greater than 1 MB , that will be a hell ) best way is to use a pattern image in gif format. Use google to find out a one.
To add a background image for you blog,
1. Edit your Template
2. Now find out
body {
( press 'Ctrl' + F to open your browser's search box)
Now paste this code line just below it , after adding the URL of your back ground image
background:url( Paste your URL of Background Image );
Background Patterns for you
background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhLg-_kG329j4tBWhB6c1WbK5M-otDJiCUnTCD9SjDQcq4Y6s4R3RwxI2OGWzVhXl-93ZkqjrBRJ-5JbUWIBVx315qtmlkcwrglnixYLIco7YjxpIvfbJhne7FGr1v5HE-fXdx8tfaNyfo/s400/elephant_pattern.gif);
background:url(http://z.about.com/d/graphicssoft/1/0/9/2/5/Textile_Pattern_Set-2.png );
background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtDFrTPoziwWfMHZmM5vUiUHETmMFkJoeB01I_w9fWl4qtXPNMl9Dyp0z1YfjBP-AyYfcjcbkbS81SYOUX852Q1-mAe5JIKijsQjSZMfmKW1UARvX-xcZFpLDRUj4819IZYGmpYmc-viFT/s400/the+pattern+tester.jpg);
Now follow the Safety Saving Steps.
And
To add a background image for you blog,
1. Edit your Template
2. Now find out
body {
( press 'Ctrl' + F to open your browser's search box)
Now paste this code line just below it , after adding the URL of your back ground image
background:url( Paste your URL of Background Image );
Background Patterns for you
background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhLg-_kG329j4tBWhB6c1WbK5M-otDJiCUnTCD9SjDQcq4Y6s4R3RwxI2OGWzVhXl-93ZkqjrBRJ-5JbUWIBVx315qtmlkcwrglnixYLIco7YjxpIvfbJhne7FGr1v5HE-fXdx8tfaNyfo/s400/elephant_pattern.gif);
background:url(http://z.about.com/d/graphicssoft/1/0/9/2/5/Textile_Pattern_Set-2.png );
background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtDFrTPoziwWfMHZmM5vUiUHETmMFkJoeB01I_w9fWl4qtXPNMl9Dyp0z1YfjBP-AyYfcjcbkbS81SYOUX852Q1-mAe5JIKijsQjSZMfmKW1UARvX-xcZFpLDRUj4819IZYGmpYmc-viFT/s400/the+pattern+tester.jpg);
Now follow the Safety Saving Steps.
And