Due to a huge demand for clickable headers, I'm writing a post to explain how to make your header clickable in Classic Blogger. (Did I miss the memo that clickable headers are the new cool Blogger thing to do?)
This is an easier method than for Beta Blogger! Since you want a clickable header, you probably already have a header image and it is hosted on a web hosting account. You will need the URL to put in the below code.
<div id="header">And, that is it. Clickable header express!
<a href="your blog.url">
<img src="image.url" border="2">