Ubuntu :: Set Weather Map As Desktop Background (gnome)?

I wanted to use a regularly- and frequently-updating weather map as my desktop background (extreme desktop tweakers can stop reading here: yes, I'm committing the unspeakable act of using a 640x480 image as the background for my 1280x1024 desktop. What can I say? I'm a pragmatic kinda guy . . .). I came up with the following solution for doing this, but wanted to post here to see if someone else might suggest something more elegant and/or superior.

First, I created an extremely simplistic bash script that downloads the weather map image (640x480 a gif) and writes it to a file in my home directory called wmap-bkgrnd.gif. It's only two lines, as follows code...

So now cron downloads the image every 10 minutes and writes it to the wmap-bkgrnd.gif file in my user's home directory. Finally, I right-clicked on the gnome desktop and selected "change background," selecting that image as my desktop background.

It works, and gives the desired effect. I now have a weather map that updates every 10 minutes as my desktop background.

So, my questions. Is there a simpler/better way to accomplish this task? I have to say I have nothing against higher-resolution images and would use one if I could find something suitable. But so far, in the way of frequently-updated maps, I've only been able to find this low-resolution one.