I have the similar problem with windows 8.
When we click start menu, anyone can see the picture tile that shows pictures from not only my pictures folder (which is okay for me) but also from skydrive which has all my certificates and scanned docs that i would not want to share/show in the tile. This pictures that are displayed from my skydrive are not in pictures folder by other personal folder.

How to restrict from showing up these pictures in the pictures tile in the start menu of windows 8?