Blog Challenge - HELP MR. O!!!

Hi guys, I need your help. 

As you can see, I have added a picture to the header.  Two problems:

1. I don't want the picture to be so high, but I want it to stretch across the whole page.  This is a technical issue.  It has to do with HTML code.  I was on the trail last night, but ran out of gas. 
2. I want to know what picture should be our header?  I only want serious suggestions, please.  Remember, it is a school blog and it has to do with the daily happenings of Room 107.

Some ideas that I had were:

• A winding road (sort of a metaphor of how we never no where life is taking us)
• A beautiful prairie sky (with the idea that "the sky's the limit")
• Olympic rings (good for now, but I'd like to have something stay there)

Some of the other teachers that I have checked out, use an open window (the blog is always open) or a picture of their school for a picture on the header blog.

What do you guys and girls think? 

BY THE WAY, I THINK THAT I ALSO CHANGED THE EDIT POST PART...MADE IT BETTER, I HOPE!