Well, you already have your own blogger blog, at least if you are interested in this user script, so you're not particularly likely ever use the "Get your own blog" link in the common blogger header, right?

This script changes it to an edit button,

which will bring you right to the template edit page for the blog in view. (If you have access to it, anyway.)

Should you want to contribute the graphics for the edit button in tan, silver, black and so on, I'll willingly update the script and host them, too. My original graphics is available in PNG and Photoshop formats.