A while ago there was a post about using your blog header/name to link you back to home pages and it was discovered that blogger did not automatically create that function for you. No little white hand for us.
See Usability Pet Peeve
I finally had time to sit and play with blogger and there is an easy fix if this is what you want to do.
Treat it like a link. On the settings page where you blog's title would normally go, make it a link. For example (a href="http://yourblognamehere.blogspot.com")Your Blog Name Here(/a)
replacing the parens with carats, of course
You can also do something similar in your subtitle, where it will appear with an underline just inviting your reader to click.
I've just done this on my practice blog, but will probably fix up the ole Blog Appetit with this here fancy new cityslicker trick sometime soon.
The Joy of Blogger (The DIY blogging site) -- Can you teach a free program to do new tricks???
Let me know if you try it and if it works for you.
UPDATE: Please see Paul's comment below. His way is easier, neater and works great. Thanks!