Today, i saw a posting on Blogger Buzz about adding an image to the header which has just been added to Blogger, so no further hacking is required. We only need to add img tag and it will do it for us. So, i'm trying to look for it on my SlackBlogs, since in this account, i still use the old design (because i had some problem after migrating to the new design) and here is what i got: a 404 error message. Probably Blogger team should resolve this problem ASAP
Update (11:31 PM): The error has been fixed by the Blogger team.