I use KDE, but it's pretty much the same thing. This will create a slideshow out of a folder in /home/yourname called "Pictures". So, whatever you want to appear in the slideshow, load it in there. Actually, in KDE you can point at individual folders within Pictures and just show a few of them, but it seems that everything is shown in Gome.
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Don't use any of my solutions on working computers or near small children.