Sorry for the second post, however I found a solution for the Panel Icons for the HTC Rose (s740) and something like a solution for the Pictures.
When you create a new panel icon you enter your image URL in Panel icons tab. However you need to insert three values there. The first value is for the portrait active icon, the second for the portrait inactive icon and the third for the landscape icon.
So you have created for example a new panel called Programs. You have two different icons and you copy them in the Windows folder. The correct URL is:
If you dont want two different icons you can always use one in all three cases. That's the solution for the panel icons.
The problem with the Picture for each page of the panel continues unfortunately. I've tried many things and I found that if you use only one URL for example \My Documents\radio.png then you get your picture only in the landscape mode, while it does not appear in the portrait mode. I tried using two values with a ";" between them and then I got nothing again in portrait and a big "X" in the landscape. (I also tried repeating the values three times, although there is no inactive picture here, of course it didnt work).
Then I tried something else. I customized the "Settings" panel which is the only panel that pre-exists and you can edit it. I inserted a new page for my "FM Radio" and I inserted the same URL as previously. Miraculously, this works !! You get a page with a picture that works both in Portrait and Landscape mods.
I'm still baffled by the fact that the same url doesn't work in a custom panel and works only in new page of an already existing panel. I will keep trying to find a solution but I think I'm all out of ideas. Any advices or people with Roses experimenting would be nice.