Yes, it's http://thoughtbroadcast.com.
I'm not sure what you mean by "if your blog is launched as a webclip from the iPad interface." I'm just typing "thoughtbroadcast.com" into my Safari address bar (on the iPad), which then defaults to "thoughtbroadcast.com/#!/cover", and the image is simply a picture from my blog (which I did not set) rotating slowly from left to right.
All I want to do is to set my background image to be the "Launch Screen Image" I uploaded specifically for this purpose. The Onswipe settings on my blog's dashboard don't appear to give me an opportunity to do this. The only options for "Cover Display" are "No cover" and "Show an image from a recent post."
Also, just to avoid any confusion... I'm not using the desktop version of Safari. The other thread apparently shows how I can use desktop Safari to emulate the iPad Safari app, but that wouldn't fix the problem I'm having.