Just found screenshots of some the premium themes available for your brand new Xbox Dashboard.  I'll update this as I find more, sorry about the quality of some of the shots, beggars can't be choosers.

Fable II Premium Theme

Forza 2 Premium Theme

Castle Crashers Premium Theme

Last Remnant Premium Theme

Gears of War 2 Premium Theme

If any of you find any more then leave a comment and I'll add them / link to them.  Man I don't give a crap about the game but the Halo Wars theme looks badass, just wait until I get some points.  I've heard that the 2 Gears of War 2 themes are identical except for the pictures in the background so I wouldn't bother buying them both, I'll try to find more screens.

Oh and thanks to Rowr for giving me the link to the original files