[axbmcuser]

Since there almost no gradients of any kind which are used in the skin at todays state, what you experience is typical banding which seems to be caused by the wallpaper behind the plain skin elements.

Where does the grey/bright/white-ish background come from? Where do the gradient-circles come from? Is this a wallpaper? If so, the skin can't do much about it. This is how todays 8bit banding looks like. You can mostly avoid it by not using wallpapers which contain such banding gradients. Good wallpapers try to compensate this by having the gradients dithered (if interested, this can be googled : - ) )

Thanks for the quick feedback. If you like let me know if it's really a background which you are using.