it sounds to me that you dragged your pictures folder from the sidebar, which really didn't move your pictures folder at all. if you click on your home folder, you should see your pictures folder (with icon) intact inside. if you want it back to the sidebar, just drag it back to where you want it. concerning your photobooth pics, though, i don't know exactly what happened to those.
EDIT: looking at your op, i'm guessing you solved the problem on your own.