Your can select folders to show on cube and enable/disable local folders or Picasa.
Has feature to download images from Picasa. Select any tag and it will get images with that tag.
There is a paid version of this application available - without ads.
IMPORTANT NOTE FOR WALLPAPER:
It is a live wallpaper, so it should be set up by going to menu (touch screen for long time), when select "Wallpaper", when select "Live Wallpapers", when find "Slideshow Cube Wallpaper" and select it, when touch "Set wallpaper".