The Best thing about Blogspot is you can change the template of your blogs as and when you like.
If you are good at coding,you can even do some code modifications of the template to suit your choice and preferences.
But,the major disadvantage of changing templates is losing of sidebar gadgets of the previous template.
Unlike WordPress.com, Blogspot doesnot retain the gadgets when you change the templates. So this is a Major concern.
But,you still can tackle this by doing the following:
1>Go to Layout->Edit Html and search for this code:
<b:section class=’sidebar’ id=’sidebar’ preferred=’yes’>
2>Once found, copy all the code starting with <b:widget id until the closing of </b:section> tag for that perticular sidebar widget section.
3>Now open a notepad and paste this code and save it. These are the HTML codes for the gadgets on your sidebar.
4>Uploading a new template: Go to Layout->Edit Html -> Choose a template file and click upload.
5>Now again find this code(given below) in the new template you just uploaded:
6>When found, then copy the widget codes from the notepad (step 3) and paste it between the