Though I had converted my blog to 3 columns, I couldn't widen the background images used in this scribe template because I don't have access to any image processing software. So, I just set the CSS to repeat the image for the extra width. This resulted in a vertical stripe in the middle of my sidebar that some of you might have noticed. I just left it as it is and it added more to the antique look (or i thought it did :)) .
But today, one of my readers David Finberg suggested that I could use the online tool called ResizR to resize any image. I used it and successfully resized the 3 background images to my blog's new width! If you have followed my 3-column conversion instructions and have a similar problem, you could try this tool too. You have to find the URL of one or more images that form the background, resize all of them and host them somewhere so that you can use them in your template.
(I have updated my Hacked Scribe template with resized images. So, if you are using Hacked Scribe, you can download the new version from here.)