Transparent desktop window

Would it be possible to have the conditions and temperature be on the desktop like the calendar program “Rainlendar”? I don’t know if you are familiar with it but its a skinnable calendar that shows up as part of the desktop on startup. I think a feature like this would be cool, especially if you could make it small enough so that it would not be in the way. What do you think?

“Why are there so many songs about rainbows?” - Kermit the Frog