Well, I'm just talking about a render, not an application, and my concerns are the textures I used which are textures from the original screensaver. Also why would you think I'd post the original screensaver?!
Showing a render with that texture is not a problem, it's like showing a screenshot of the screensaver.
The problem is if you're going to redistribute the texture within a game or as part of a pack, especially if you're going to sell it. Strictly speaking, it could be a problem, although in this case I highly doubt it, I don't think Microsoft or the owner of the rights to that image are looking for people to use their texture to send them a "Cease and desist".
So having a render of an object, with the texture, shouldn't be a problem.
Still, it's important to note that some images are more problematic than others, for example, using the red cross.