For the calvin and hobbes lockscreen, the posted images weren't at the right resolution/transparency, so for the background, use: http://blog.mattgnann.com/blogfiles/lockslider.png and place it as /usr/share/themes/themename/backgrounds/lockslider.png And for the calvin, use: http://blog.mattgnann.com/blogfiles/...iderThumb3.png and place it as /usr/share/themes/themename/images/LockSliderThumb.png then restart, and voila! The calvin could use better transparency, there's still a little white around the edges, I didn't feel like fixing it. :P