Create custom background in your blogspot

To create background which i have in my blog
Go to Layout
Pick new template
Select tekka
Then go to edit HTML
and find the following
1) in body;
insert the following code in between the brackets anywhere
background-image: url(http://lh4.ggpht.com/nishurs/SKk6xcYtxJI/AAAAAAAAARM/j6cMOi0RvJQ/s800/december%20190.jpg);
2)in main
insert the following code in between the brackets anywhere
background-image: url(http://lh4.ggpht.com/nishurs/SKk6xcYtxJI/AAAAAAAAARM/j6cMOi0RvJQ/s800/december%20190.jpg);
3)in sidebar
insert the following code in between the brackets anywhere
background-image: url(http://lh4.ggpht.com/nishurs/SKk6xcYtxJI/AAAAAAAAARM/j6cMOi0RvJQ/s800/december%20190.jpg);

http://lh4.ggpht.com/nishurs/SKk6xcYtxJI/AAAAAAAAARM/j6cMOi0RvJQ/s800/december%20190.jpg this is the URL of the image that my blog has, you can change it to custom images of your own. For that you have to upload photos to any of the image hosting websites and get the URL of image or if it is already in the web copy the image location and paste it instead of the above image