I have previously testing putting a clickable image to the post title, a report and the instruction of how to do it you can find at Testing putting a clickable image in post title.
I have repeated it here in this post. Click on the image to take you to the Blogger online book (in progress). I have tried to make clicking the title image open in new window and/or adding some text after the image, but apparently New Blogger limit the character length of what you can put in the post title.
BTW, I generated the button you see in the post title with a free button generator and the condition for using their services is that you have to post a clickable icon that leads to their site. Click on it if you want to generate your own buttons.