I've been bugged for a while now by the narrowness of this old template, and I hate the guts of the new template designer, especially since all the templates it provides are absolutely hideous. (Sorry, Blogger, I tells it like it is.)
So I've widened it a bit. It's hardly wide enough for the widest YouTube embeds I've done (see this for what I mean, though it used to be worse), but I've honestly been wanting it to be wider for a long time now, so I'm happy with the change.
None of that stupid fancy stuff for me.